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Operator
Good morning, ladies and gentlemen and thank you for standing by. Welcome to the SBA fourth quarter results conference call. At this time, all participants are in a listen-only mode. Later we will conduct a question and answer session. Instructions will be given at that time.
(OPERATOR INSTRUCTIONS)
As a reminder, this conference is being recorded. I would now like to turn the conference over to our host and Vice President of Capital Markets, Ms. Pam Kline. Please go ahead.
Pam Kline - Vice President of Capital Markets
Thank you for joining us this morning for SBA's fourth quarter 2007 earnings conference call. Here with me today are Jeff Stoops, our President and Chief Executive Officer; Kurt Bagwell, our Chief Operating Officer; and Tony Macaione, our Chief Financial Officer.
Before we get started, I need to get the standard SEC disclosure out. Some of the information we will discuss on this call is forward-looking, including but not limited to any guidance for 2008 and beyond. These forward-looking statements may be affected by the risks and uncertainties in our business. Everything we say here today is qualified in its entirety by cautionary statements and risk factors set forth in last night's press release and in our SEC filings, particularly those set forth in our Form 10-K for the fiscal year ended December 31, 2006, and our quarterly reports on form 10-Q, which documents are publicly available. These factors and others have affected historical results, may affect future results and may cause future results to differ materially from those expressed in any forward-looking statements we may make. Our statements are as of today, February 22nd, 2008, and we have no obligation to update any forward-looking statement we may make. Our comments will include non-GAAP financial measures as defined in Regulation G. The reconciliation of these non-GAAP financial measures to their most directly comparable GAAP financial measures and the other information required by Regulation G is included in our earnings press release, which has been posted on our website, www.sbasite.com.
Tony, would you comment on the fourth quarter results, please.
Tony Macaione - CFO
Thanks, Pam, and good morning everyone.
As you saw from our press release last night, our fourth quarter financial results were excellent. We were at the high end or above our guidance for leasing revenues, Tower Cash Flow and adjusted EBITDA, and exceeded the midpoint of our guidance on equity-free cash flow. Total revenues were $108.9 million, up 12.6% over the year earlier period. Site leasing revenues for the fourth quarter were $84.7 million, or a 13.8% increase over the fourth quarter of 2006. This leasing revenue growth was driven by both organic growth and acquisitions. Site lease and segment operating profit was $62.9 million. Site leasing contributed 95.4% of our total segment operating profit in the fourth quarter. Tower Cash Flow for the fourth quarter of 2007 was $63.2 million, or a 17.3% increase over the year earlier period. Tower Cash Flow margin was 76.5%, up 170 basis points over the year earlier period. Our services revenues were $24.2 million, compared to $22.3 million in the year earlier period. Service revenues were up 9% sequentially from the third quarter of 2007. Our services segment operating profit was $3 million, compared to $2.6 million in the year earlier period. Service to segment operating profit margins were 12.5% in the fourth quarter, up from 11.8% in the year earlier period.
SG&A expenses for the fourth quarter were $11.9 million, including noncash compensation charges of $1.4 million. This compared to SG&A expense of $10.8 million in the year earlier period, including noncash compensation charges of $1.2 million and one-time AAT integration costs of $500,000. Fourth quarter SG&A expenses were negatively impacted by several one-time items aggregating approximately $500,000. We expect quarterly cash SG&A expenses to be approximately $10 million for 2008. Other noncash expenses in the fourth quarter, including other than temporary impairment charge of $15.6 million, related to certain auction rate security investments we held at December 31st, 2007. As of December 31st, 2007, the company's short-term investments consisted of 9 auction rate securities that had a par value of $70.7 million.
Auctions associated with these investments have failed as a result of lack of demand in the marketplace. The company had not been able to liquidate these securities at par as of December 31st, 2007. As a result of the Company's assessment of a number of factors, including market conditions and the credit quality of certain of these securities, the estimated fair value of some of these investments no longer approximate fair - par value. Subsequent to December 31st, we sold at par value six of these auction rate securities, which totaled $40.9 million of the companies total par value of $70.7 million. Based on the subsequent sale, these six securities are carried at par value at December 31st, 2007. The company still holds three auction rate securities with a par value of $29.8 million, and a fair value as of December 31st, 2007 of $14.2 million, and we continue to receive interest on these securities monthly. The three remaining auction rate securities are not backed by any CDOs or subprime-related assets. They are insured - they are issued and insured by monoline bond insurers. Given the current state of the credit market and the lack of demand in the marketplace for auction rate securities, we have discontinued purchasing these instruments and have restricted our cash investments to only those that are highly liquid and short-term in nature, and are highly rated.
Net loss during the fourth quarter was $28.9 million, compared to a net loss of $24.3 million in the earlier period. Net loss per share for the fourth quarter was $0.27, compared to a net loss of $0.23 in the year earlier period. Excluding the $15.6 million noncash impairment charge on the auction rate securities, our net loss per share would have been $0.13. Our weighted average shares outstanding for the quarter were 106 million. Adjusted EBITDA for the fourth quarter 2007, which excludes certain items such as noncash leasing revenue and ground lease expense, noncash compensation and the noncash charge on our short-term investments, was $56.1 million in the fourth quarter, or an 18% increase over the year earlier period. Our adjusted EBITDA margin was 52.5%, up from the 50.4% margin in the year earlier period.
Once again, equity-free cash flow increases materially in the quarter, reflecting strong adjusted EBITDA growth. equity-free cash flow for the current period was $33.2 million, a 60% increase over the year earlier period. equity-free cash flow per share for the current period was $0.31 per share, or a 55% increase over the year earlier period. In the fourth quarter we acquired 175 Towers, built 20 Towers and ended the year with 6,220 Towers owned, and the rights to manage approximately 4,500 additional or potential communication sites. Cash capital expenditures in the fourth quarter were $59.4 million, of which we spent $1.2 million on maintenance Tower CapEx, $1.9million on augmentation and rebuilds, and $500,000 on general corporate CapEx. We also spent $45.1 million of cash on acquisitions and earnouts, and $4.2 million on new Tower builds and new build in process. In respect to the land underneath our Towers, in total we spent $12 million in cash to buy land and easements and to extend ground lease terms. Our ground lease purchase program has gone very well and we finished the year significantly ahead of plan, and spent a total of $34.1 million on this program in 2007.
At this point, I'll turn things over to Pam, to who will provide you with an update on our liquidity position and our capital structure.
Pam Kline - Vice President of Capital Markets
Thanks Tony.
SBA ended the fourth quarter with $1.555 billion of commercial mortgage backed pass through certificates outstanding, $350 million of 0.375% convertible senior notes, $107.9 million of cash and restricted cash, and net debt of $1.8 billion. We issued 2.9 million shares of our stock in the fourth quarter, 2.6 million of which were for acquisitions and our current share count at year end was 108.4 million. We did not repurchase any shares of our common stock in the fourth quarter and our Board authorization to do so expired December 31st, 2007.
The company's net debt to annualized adjusted EBITDA leverage ratio was 8.0 times at December 31st, 2007. Our short-term investments of $55.1 million related to auction rate securities are not included in our calculation of liquidity or net debt, nor are the $40.9 million of cash proceeds we received post-year end when we sold six of the auction rate securities, which on a pro forma basis would have reduced our leverage ratio below 8 times. As of year end, all of our debt was fixed rate with a weighted average cash coupon of 4.9%. Our fourth quarter cash interest coverage ratio, adjusted EBITDA to net cash interest, was a very strong 2.7 times compared to 2.0 times in the year earlier period.
In January 2008 we obtained a $285 million senior secured revolving credit facility. This facility has a three-year life and allows for borrowings to be used to build or buy Towers, or for lease or ground lease buyouts. Amounts borrowed under this facility will accrue interest at LIBOR plus a margin which ranges from 150 basis points to 300 basis points, or at a base rate plus a margin that ranges from 50 basis points to 200 basis points. The spread to be paid on top of either the LIBOR or the base rate will be determining based on certain leverage levels calculated at the borrower level. As of today, approximately $183 million is available under the facility, of which $20 million has been drawn and is outstanding at a rate of LIBOR plus 150 basis points. On a pro forma basis, when you combine the $40.9 million of proceeds from the sale of the auction rate securities with cash and restricted cash at year end, and the amount currently available under the credit facility, liquidity at December 31st, 2007 would have been approximately $312 million, which we believe puts us in a very strong position.
Kurt, would you give us an update on operations.
Kurt Bagwell - COO
Thanks, Pam, and good morning.
As you've heard through the tally of the numbers, the fourth quarter was solid for us at SBA. Our customers were very busy with a variety of network buildout, growth and enhancement activities, and we feel we captured at least our fair share due to the excellent quality of our Towers, their locations and the hard work and diligence of our employee base. More specifically, our incremental Tower leasing revenue signed in the quarter was similar to our very successful third quarter in terms of new leases and amendments. This was also our best net lease up quarter since the AAT acquisition, with post AT&T Cingular churn dropping back to normalized levels.
During this time rent to state firms, and our average cash basis rents across all 15,429 leases in our portfolio, is up 5% year-over-year to $1,807 per month. During the quarter, 72% of our leasing activity came from new leases, while 28% came from amendments to existing installations. The strong activity on the amendment side is from technology overlays, back up power, wireless back haul and other capacity and performance-enhancing modifications on the Tower and on the ground. We are currently at 2.5 tenants per Tower, and this number has been relatively steady, as we have continued to build and buy lower maturity Towers with high available capacity and excellent growth characteristics. As is typical at any time during the year, and with fourth quarter being no exception, certain carriers are more active than others but the combined activity level has continued to stay high. Our leasing backlog is strong as we work through the first quarter of 2008, and we expect the year to get busier as it move along, and overall to rival or be bigger than 2007.
Our new Tower build team completed 20 Towers during the quarter, their strongest effort since we restarted the program a couple of years ago, and putting us at 61 completed for the year. New Tower builds remains very competitive but we have stayed disciplined with our site-by-site selection, modeling and approval progress, and our production has been steadily growing. We intend to increase annual new build production over the next several years. We also bought 175 Towers during the quarter, which puts us at 612 Tower acquired for the 2007 calendar year. The combined asset growth from these two initiatives put our year end Tower count at 6,220, an increase of 12% over the year ago period. We intend to continue to this in 2008 with targeted portfolio growth of 5 to 10% from acquisitions and new builds.
On the operational side of our Tower portfolio, we continue to take advantage of our large scale. We've been able to successfully operate under a structure where our expense ratios of personnel, ground leases, repairs, maintenance and other cost drivers continues to improve. The percentage of our Towers for which we own or control more than 50 years, the underlying land grew to 23.3% as of December 31st, contributing to our strong margin growth. We're confident in our ability to maintain a simple, low--cost structure that is steady and predictable. We expect Tower Cash Flow and adjusted EBITDA margins to continue to grow.
Lastly, on the services side of our business, we finished off the year in good fashion, with the highest revenue and profit quarter of 2007. Revenue of $24 million was up 8%, and segment operating profit of $3 million was up 15% over the year earlier period. This capped off a typical seasonal year for services where each quarter grew sequentially, and we expect a similar pattern in 2008 for this segment of our business.
At this point, I'll turn the call over to Jeff.
Jeff Stoops - President and CEO
Thanks, Kurt, and good morning, everyone.
We had a very good fourth quarter, and we're very pleased with the year as a whole. The year 2007 marked the 4th consecutive year of strong organic growth, portfolio growth and balance sheet improvement for SBA. The year played out as we predicted it would, with strong carrier activity in the aggregate although not necessarily uniform among the various carriers. We saw more activity in the second half of the year than the first half, which bodes well for our 2008 financial results. We ended the year slightly ahead of expectations on organic lease-up, ahead on services gross profit, well ahead on acquisitions and well ahead on ground lease purchases. These results drove our final adjusted EBITDA for the year to the highest in Company history. I want to thank our customers and our employees for another very successful year.
We think 2008 will also be a good year and similar to 2007, in that we expect to see strong carrier activity in the aggregate, providing us with solid lease-up and solid services results. We expect to continue to add quality Tower assets and purchase additional land under our Towers. We are progressing well on the acquisition front and feel very good about hitting our 5 to 10% portfolio growth goals. Our acquisition successes and our strong operational lease-up in the fourth quarter gives us a good start in 2008 and, as a result, we have increased our full year guidance for 2008. At this time, we are projecting another year of material growth in all key metrics, particularly growth in equity-free cash flow per share, where we have established ourselves as the clear industry leader.
There are a number of factors that we believe will drive continued strong organic growth. Data services from our customers continue to grow, driving carrier revenues and thus requiring additional network investment. There remains a large amount of AWS spectrum to be built, including by a number of new market entrants. AT&T and T-Mobile are expected to be busy all year with UMTS upgrades. We expect material network activity out of Sprint, although in what form we're not quite sure. Verizon is expected to stay steady. Additionally Clearwire could turn out to be a positive factor for us later in the year, if they resume network development at their early 2007 pace. We just saw this week the introduction of a number of all-you-can-eat voice plans that should require additional network capacity, and then there is the 700 megahertz spectrum auction, the benefits from which won't even begin to be recognized by the Tower industry until 2009. All in all, we believe 2008 will be another good year for carrier activity, our organic leasing growth, and our services business.
We're extremely well positioned to increase our Tower portfolio materially again this year, primarily for two reasons. First, our new credit facility gives us plenty of attractively=priced capital. Second, we see many additional opportunities out there, as we believe the current capital markets conditions are causing some who have been sitting on the fence to decide to sell. Since our view on future carrier activity and operational growth of these assets remains very positive, and we have the capital, we are eager to continue our investments in Tower acquisitions when our internal rate of return requirements are met. We continue to see a number of quality high growth Tower assets for sale at reasonable accretive prices that meet or exceed our return requirements. Counting acquisition transactions currently under contract, we are already over 35% of the way to the high end of our goal of 10% portfolio growth.
Under current market prices and conditions, our models tell us that the best use of our discretionary capital is to continue to buy growth assets for cash to maximize future growth in equity-free cash flow per share. We believe that this use of capital will produce superior growth in equity-free cash flow compared to stock repurchases or acquisitions for stock, although both of those uses would also produce good growth in equity free cash flow per share. We will continue to carefully monitor the market to make sure these priorities remain appropriate, and if our conclusions change, we have the ability to change our discretionary spending virtually immediately.
We are excited about the future. We have successfully positions SBA as a fast-growth company with high-quality assets in a very favorable wireless market. Our customers are very busy and expected to stay busy. We are executing well on our three-part strategy of organic growth, portfolio growth and capital structure management. We are achieving our goal of material growth in equity-free cash flow per share, and as you can see from our increased 2008 outlook, we expect 2008 to be another good year for SBA.
Operator, at this time I think we're ready for questions.
Operator
(OPERATOR INSTRUCTIONS)
We'll take our first question from the line of Gray Powell with Wachovia, please go ahead.
Gray Powell - Analyst
Hi, guys, good morning.
Jeff Stoops - President and CEO
Good morning.
Gray Powell - Analyst
Just a couple of quick questions. Has anything changed in your outlook for carrier activity overall, or was it mainly the upside in acquisitions this quarter that drew the upside in your 2008 guidance?
Jeff Stoops - President and CEO
The increase in the guidance, Gray, is as a result of the operational lease-up in the fourth quarter ,which doesn't begin to hit the financials until the first or second quarter of 2008, and that was ahead of our expectations, and it was also ahead - it was also because of the acquisitions and where we are on that front. We are still at this point projecting lease-up rates at the same rate that we enjoyed overall in 2007.
Gray Powell - Analyst
Great. And then you can just talk about the characteristics of some of the acquisitions you're making, just in terms of tenants per Tower and the cash flow margins?
Jeff Stoops - President and CEO
Yes. We're still pursuing a wide variety of different types of assets, focusing primarily on the projected returns. But the Towers Gray, range from 2.5 to 3-tenant that we're buying for 13 times to 1-tenant Towers look just like new builds that's we're buying for over 20 times, at price ranges that go from $300,000 a Tower up to $750,000 or more. So it's very -- it's very much across the board. But I will give you our full year 2007 kind of averages. We bought Towers throughout the entire year at a Tower Cash Flow multiple run rate of 17 times, which we would think is about a 15 times forward, and at a price per Tower of $538,000.
Gray Powell - Analyst
Okay. Well, great. Thank you very much.
Operator
And the next question is from the line of Brett Feldman with Lehman Brothers. Please go ahead.
Brett Feldman - Analyst
Thanks for taking the question. Just real quick, and I apologize if you gave these data points, what's the total number of actual tenants you have on your Towers right now?
Jeff Stoops - President and CEO
2.5.
Brett Feldman - Analyst
That's the average. Do you know what the total is?
Jeff Stoops - President and CEO
Yes.
Tony Macaione - CFO
15,429.
Brett Feldman - Analyst
Thanks. And then also in terms of same Tower revenue growth and Tower cash flow growth, do you have those stats, what they were in the fourth quarter?
Jeff Stoops - President and CEO
Yes. If you take out the Cingular merger churn, revenue was 10% and Tower Cash Flow was 13%.
Brett Feldman - Analyst
Great. And then you mentioned the mix between new leases and augmentations, and it looks like it's getting closer to 70/30, I think historically it's been more 80/20. Do you that mix is going to be more representative of what is going to happen 2008, especially when you consider all the business you're getting from augmentation-related work, like the UMTS overlays maybe some WiMax stuff, and if that is the case, are you finding that the augmentation are maybe revenue-intensive than they have historically been?
Jeff Stoops - President and CEO
We definitely see more augmentations in volume, Brett, because we think AT&T and T-Mobile in particular will be very busy all year with UMTS overlays. We also think we'll see a lot of brand new tenancies from a number of players, not the least of which would be Metro and Leap, who are only generally new tenants, of course, in their markets. So whether a change - whether one of those offsets the other, probably do not have a good guess for that right now. But we do expect good augmentation and amendment activity for at least the next several years. And you know, the amount of dollars that we get, it varies. I mean it ranges from a low of 3 or 400 to add a couple of lines to over 1,000, depending on what is being done out at site. I'm not sure I can generalize for you there.
Brett Feldman - Analyst
Okay. And then one last question on a different subject. I think you said that your ability to repurchase shares actually expired at the end of the year, and while it's clear that your primary interest is on acquisitions as opposed to buybacks, why not just have another authorization anyhow? I know you can't use the revolver, but you could still use your cash flow from operations if you thought it was very opportunistic.
Jeff Stoops - President and CEO
We could. It is just a Board authorization that we can go to our Board and get at any time if we have good reason, and your point is well taken.
Brett Feldman - Analyst
Okay. Well, thank you for taking the questions.
Operator
The next question is from the line of Clay Moran with Stanford Group. Please go ahead.
Clay Moran - Analyst
Good morning. Two questions. On the increase in the EBITDA guidance, can you just confirm that half of that would be from organic sources and half from acquisitions? And then you talked about the credit markets and your -- how you're viewing Tower acquisitions, and that could change depending on what happens with the credit markets going forward, but can you just give a little more color sort of on how you're looking at it based on what you know today? Do you see this as an opportunity to scoop up some assets possibly at cheaper prices, or are you already a little bit more cautious than you were a year ago? Thanks.
Jeff Stoops - President and CEO
On your first question, Clay, it is roughly 50/50, maybe 40/60 one way or the other, of which I'm not sure but that's close. On the acquisitions, we have - the way we've handled the change in the credit markets is we do believe that others will not be as well positioned as we will to access capital and take advantage of the traditional mom and pop market, at least the folks who have traditionally competed against us there. And the way we've kind of worked pricing is we've picked up our rate of return requirements and there is a -- there are two schools of thought as to whether you wait for lower prices, or whether you pick up your return requirements and as long as the deals continue to meet those, you move forward because you really don't know what the future would bring and you're buying stuff that is at or above where you want it to be from a return requirement, and we're currently in that latter camp right now. So we have picked up our return requirements a little bit, which is -- has caused us to probably get better deals than -- and we would probably see that as higher growth potential, even though the Tower Cash Flow multiples may be similar to what we paid a year ago, but our projected returns are higher. So that's how we're moving forward and trying to work our way through the current environment.
Operator
The next question is from the line of Rick Prentiss with Raymond James. Please go ahead.
Rick Prentiss - Analyst
Thanks, good morning guys.
Jeff Stoops - President and CEO
Hey Rick.
Rick Prentiss - Analyst
A couple of quick questions for you. One, I think Tony, did I hear you right on the one-time, it actually was a negative half million impact on EBITDA in the fourth quarter? And is there any one-timers forecast for the first quarter, is the first question?
Tony Macaione - CFO
Yes, Rick. This is Tony. There was half a million dollars in the aggregate and there was no one individual that I would consider that material, so there were several items that net/net was a negative $500,000. And no, there are not any one-timers that's we're projecting for the first quarter guidance.
Rick Prentiss - Analyst
And then on the short-term investment item, given that you guys have sold six since the end of the year but kept three, should we assume since these things are still bearing interest, you're not looking to sell these at a loss, even though you took the fair market writedown, that you would get out of them but only as they closer to par; is that kind of the thought process?
Jeff Stoops - President and CEO
That's the current thought process. And one of the things that we did, and we've taken these things down from $120 million at the end of Q3 to now $29 million, so we've kind of boxed this in, so - we're not happy with the $29 million that we still are holding, but it's a small enough number now where we do not have any need to sell at a loss, so we'll see what the market does.
Rick Prentiss - Analyst
Exactly. Okay. And then, as you think about leverage, you guys are at 8 times excluding that short-term stuff, now that you've gotten some of that cash back a little bit less than 8 times, what do you look at as far as your target leverage range and your thoughts of where it might go?
Jeff Stoops - President and CEO
I think we're comfortable at these levels, given what we're doing with our capital. I mean a year ago, Rick, I might have been ready to debut a 9 times target leverage level, but in light of the credit market conditions we're comfortable and we're going to stick with our 6 to 8 and still comfortable at around the high end of that at 8 times.
Rick Prentiss - Analyst
Sure. And then there was a lot of -- a week or two or three weeks ago about industry consolidation. How do you think about industry consolidation within the Tower space, when does it make sense? Does it make sense? Is scale important? How do you guys think about the potential for larger industry consolidation within the Tower group?
Jeff Stoops - President and CEO
Well, it's certainly possible, obviously. There will be a lot of SG&A synergies that could come out of it. And I guess the way we think about it is we feel like we are producing superior returns on our independent path, through our ability to materially grow equity-free cash flow per share at the highest rate in the industry. And when our views change on that, maybe other things change. But it continues to be and it always has been really a pure financial decision; how are you going to make the most money for your shareholders? Because unlike in other industries, there is really no strategic reason why consolidation should occur in our industry.
Rick Prentiss - Analyst
Right.
Jeff Stoops - President and CEO
It's all financial.
Rick Prentiss - Analyst
Right. And then the final question we had the wacky Wall Street Journal gas bladder earlier this week, and idea we've seen floated before, too, but I guess it's an opportune time to touch on left field technologies. Do you guys see anything out there, maybe Kurt would be a good one for this one, as far as smart antennas or DASS systems, or anything else out there that might be a little bit more real than somebody pumping a bunch of hydrogen in a balloon.
Kurt Bagwell - COO
Rick. We look at that all of the time and we keep up with that pretty well. There is really nothing that I see out there that is looming. The DASS stuff I would tell you is very real, and we view it as somewhat complementary thought, because it's typically fill-in stuff where you can't get the Tower zoned or things like that. I think that's the most real technology, but again I view it more as complementary than competitive, and the other stuff is - you know, I mean gas balloon thing is not a worry at all. There is really no - I don't think any capacity in that or anything other than a minor rural story.
The carriers continue working with the OEMs every day to come up with ways to squeak a little more capacity out of the existing bandwidth and product, physical product. But they've been doing that for years. And that's good for them. We need them to stay healthy financially, too. So it's a balancing act. But there is really nothing out there that we feel is looming.
Rick Prentiss - Analyst
And the DASS system would typically be rolled out in a place where there is no Towers anyway, I would think.
Kurt Bagwell - COO
Yes. It's really a fill-in strategy in a lot of cases.
Rick Prentiss - Analyst
For the very, very tough to zone areas.
Kurt Bagwell - COO
Or an urban area.
Rick Prentiss - Analyst
Right. Okay. Hey, good luck guys.
Kurt Bagwell - COO
Thanks.
Operator
Your next question is from the line of Richard Choe with Bear Stearns. Please go ahead.
Richard Choe - Analyst
Hi. To follow-up on the some of the acquisition questions, can you give us a sense on over the past few deals, what has changed and what the specific characteristics of the Towers were like? Because we've seen this one deal at 750 per Tower and then an all cash sale 440 per Tower, and then this other deal at around 550, 540. Can you give us a little more color on - in terms of cash and equity, the credit markets and the equity markets, what kind of drove the different pricing in these deals?
Jeff Stoops - President and CEO
Well, the different pricing was all a function of the maturity of the Tower, the current tenants per Tower on the Tower, and where we thought growth would go on that Tower over a forward 5-year period, which we then used to project out what our return requirements are and if they're met, we move forward and if they're not, we do not. So that's why you get the wide variation in price per Tower. It's a function of tenants per Tower. So for the full year numbers, I think the average was around 1.5, 1.6 tenants per Tower. On the stuff that was bought at higher prices, it would have been a higher tenancy per Tower.
The mix on the cash and the stock was -- in the fourth quarter we had a larger transaction that was driven by the seller, who wanted a tax-free exchange treatment, so that accounted for most of the stock that we issued, but we also from time to time issue stock in acquisitions to balance out our leverage, to extend our capital. We went to all cash in '08, as we did not like the price of our stock, and with now the credit facility in place, we have all of the cash we need to continue to go that route as we move forward. But we'll keep monitoring things and have the opportunity to use a mix where we think it's in our best interest to do so, and best interest is all about maximizing growth and equity-free cash flow per share.
Richard Choe - Analyst
Great. Thank you.
Operator
(OPERATOR INSTRUCTIONS)
We'll take the next question from Jonathan Atkin with RBC Capital Markets. Please go ahead.
Jonathan Atkin - Analyst
Yes. Good morning. I'm curious, within CapEx, how much specifically you spent on Tower augmentation in the quarter? And I apologize if these were addressed earlier, but what kind of multiples are you seeing on ground lease purchases? And then with respect to your '08 guidance, what sorts of 4G or WiMax-related expectations are kind of built in?
Kurt Bagwell - COO
John, this is Kurt. On the Tower augmentations, we spent about $1.9 in the quarter gross on that. So it was a little higher than typical but not much. And a lot of that we get back from the carriers in capital contributions.
Jonathan Atkin - Analyst
Approximately what portions of the time do you have think to about augmenting a Tower when you receive the lease application?
Kurt Bagwell - COO
Boy, I tell you it's not very often. I approve those myself, anything that is substantial. rAnd I mean it's probably one out of 15 or 20, and some of them are small, some of them are a little bigger, but it's not a real often occurrence.
Jonathan Atkin - Analyst
Right.
Kurt Bagwell - COO
Ground lease purchases are averaging around 12 times current year's rent, and really there is no WiMax in the '08 numbers per se, Jonathan. I mean what we did, we really don't do it quite as granularly as you might think. We really take a view of the overall lease-up numbers from the year that we're in, and kind of decide amongst the group, and using all of the data that we have, is it going to be higher, lower or the same. And there really was no WiMax in '07, so you could say there is none in -- well that's not true. There was some Clearwire in '07. But whatever they contributed towards our '07 results, that would be all that would be in, in '08.
Jonathan Atkin - Analyst
Great. Thank you very much.
Operator
Our next question is from the line of Jason Armstrong from Goldman Sachs. Please go ahead.
Jason Armstrong - Analyst
Thanks, just a couple of follow-up questions. First on the auction rate securities, you said you obviously sold six at par and you got a big share cut associated with the other three. Could you talk us through, to the best of your knowledge, is there any sort of material underlying quality differential between the six that you sold and the three that remain? And then second question, raising guidance, Jeff I think you indicated sort of a 50-50 split between organic versus acquisitions. On the organic side, is this something you saw exiting 4Q that was relatively broad-based across the carriers, or are there one or two specific customers sort of driving the increase?
Jeff Stoops - President and CEO
Yes. I'll start with the latter first. It was really all about the leases and amendments we signed up in Q4. They were just above where we thought. So because those don't hit the financials until '08, it was really what has already been done that allowed us to increase a portion of the outlook, with the other being acquisitions. And there -- it's pretty broad. I mean there is -- our top four customers, in no particular order, were AT&T, Metro, T-Mobile, Verizon, both new leases, and amendments. So it's coming from a variety of different spots. There wasn't much Sprint in Q4, as I think everybody knows, and we'll see where that heads as we go forward. And clearly there were differences in the auction rate securities on what we were able to sell for par, and what we've held on the books and marked down. I mean, that's the best -- that's the basis of the differentiation, is an analysis of the underlying securities.
Jason Armstrong - Analyst
Right. Thank you.
Operator
(OPERATOR INSTRUCTIONS) And with that being said, I'll turn it back to the conference room for closing announcements.
Jeff Stoops - President and CEO
Great. Thank you. And thanks everyone for joining us today. We look forward to reporting our first quarter results. Thanks.
Operator
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