Rodney Smith
Executive Vice President, Chief Financial Officer and Treasurer at American Tower
Thanks, Steve. Good morning and thank you for joining today's call. We are off to a solid start to 2024 with Q1 performance exceeding our initial expectations across many of our key metrics. These results, together with the positive trends highlighted by Steve, the various initiatives we have in place to drive profitability and margin expansion and our optionality and discipline and selectively deploying capital towards projects yielding the most attractive risk-adjusted rates of return, give us confidence in our ability to drive strong, sustained growth, quality of earnings and shareholder returns for 2024 and beyond.
Before I dive into the results and our revised 2024 outlook, I'll touch on a few highlights from the quarter. First, the strong reoccurring fundamentals that underpin our business are again highlighted in our Q1 performance with consolidated organic tenant billings growth of 5.4% and another exceptional leasing quarter at CoreSite, including its highest quarter of retail new business signed since Q4 of 2020. Furthermore, we continue to demonstrate cost discipline resulting in strong year-over-year cash adjusted EBITDA margin expansion, which I will touch on in a moment.
Next, in India, the collection trends we saw in Q4 of 2023 continued into Q1, allowing us to reverse approximately $29 million of previously reserved revenue. Separately, while we continue to anticipate a second half 2024 closing on our sale of ATC India to Brookfield, we have already made progress in accelerating certain payments included in the potential $2.5 billion total proceeds associated with the transaction, including the repatriation of approximately $100 million net of withholdings tax back to the US earlier this month.
Additionally, we are making progress towards monetizing our optionally convertible debentures issued by VIL ahead of the anticipated closing of our India transaction. executing the intended purpose of the debentures in serving as a liquid asset to backstop outstanding receivable balances.
We expect to use the anticipated proceeds from the India sale to pay down existing indebtedness, we will continue to keep our shareholders informed as incremental progress is made towards the closing of our transaction. Finally, we successfully accessed the debt capital markets last month, issuing $1.3 billion in senior unsecured notes at a weighted average cost of 5.3%, with proceeds used to pay down floating rate debt.
Turning to first quarter. Property revenue and organic tenant billings growth on Slide 6, consolidated property revenue growth was 3.3% or over 4.5%, excluding non-cash straight line revenue while absorbing roughly 100 basis points of FX headwinds. US and Canada property revenue growth was approximately 1.8% or over 4% excluding straight line, which includes over 1% impact from Sprint churn.
International revenue growth was approximately 3.7% or roughly 6%, excluding the impacts of currency fluctuations, which includes a benefit associated with the improved collections in India partially offset by the timing of the sale of our Mexico fiber business at the end of Q1 in 2023 and a reduction in Latin America termination fees as compared to the prior year.
Finally, revenue in our data center business increased by 10.6% continuing the outperformance versus our initial underwriting plan as strong demand for hybrid and multi-cloud IT architecture continues and the backlog of record new business signed over the last two years begins to commence in a meaningful way.
Moving to the right side of the slide, consolidated organic tenant billings growth was 5.4% and supported by strong demand across our global footprint. In our US and Canada segment, organic tenant billings growth was 4.6% and over 5.5% absent Sprint related churn, as expected, growth in the quarter was slightly below our full year guidance of 4.7%.
As we lap modestly elevated churn that commenced in Q2 of 2023, we would expect Q2 and Q3 growth rates to each accelerate to roughly 5% before a step down in Q4 as we commence the final tranche of contracted Sprint churn, all supportive of our 2024 outlook expectation. Our International segment drove 6.5% in organic tenant billings growth, reflecting an expected step down from the Q4 2023 rate of 7.7%, as we see moderation in CPI-linked escalators. Meanwhile, contributions from colocation and amendments remain strong with another sequential acceleration in Europe and a continuation of elevated contribution rates of around 8% in Africa.
Turning to Slide 7. Adjusted EBITDA grew 5.2% or nearly 8%, excluding the impacts of noncash straight line, while absorbing 90 basis points in FX headwinds. Cash-adjusted EBITDA margins improved approximately 240 basis points year-over-year to 64.9%, taking certain expense timing in India reserve benefits and further supported by our ongoing cost management focus. In fact, cash SG&A, excluding bad debt declined approximately 5% year-over-year in Q1 and was down roughly 7% of our Q1 2022 levels.
Additionally, gross margin from our US services business came in just over $16 million, a decline of roughly 50% year-over-year, though representing an acceleration of nearly 70% of our Q4 2023 levels. This performance, together with the broad-based application pipeline buildup discussed by Steve in his prepared remarks, gives us confidence in our expectation for accelerating activity continuing through the duration of the year and is supportive of our full year US services outlook. Moving to the right side of the slide, attributable AFFO and attributable AFFO per share grew by 10% and 9.8%, respectively, supported by high conversion of cash adjusted EBITDA growth to attributable AFFO.
Now, shifting to our revised full year outlook. As I mentioned, we are pleased with the results to date and the sustainable demand trends underpinning our performance. However, given the close proximity to our previously released guidance, we have kept core full year assumptions largely unchanged. With that in mind, our revised outlook includes several notable updates. First, we have taken the strong collections activity in India through the first quarter which as I mentioned earlier, resulted in approximately $29 million in revenue reserve reversals compared to approximately $16 million in revenue reserves assumed for Q1 in our prior outlook, resulting in a net benefit to plan of $45 million for property revenue, adjusted EBITDA and attributable AFFO.
Reserve assumptions for April through December remained unchanged, resulting in a net reserve for the year of $20 million compared to the prior year outlook assumption of $65 million. Next, we have revised our FX assumptions for the year, resulting in a modest headwind compared to our prior outlook.
Finally, while our net interest assumptions remain relatively unchanged, we have increased our interest expense due to elevated rates, which was partially offset by modest interest expense reductions through a reduced debt balance attributed to the accelerated India proceeds I mentioned earlier and further offset by higher interest income.
With that, let's dive into the numbers. Turning to Slide 8. We are increasing our expectations for property revenue by approximately $30 million compared to prior outlook, driven by $45 million of upside related to the positive collections in India during the first quarter, partially offset by $15 million associated with negative FX impacts. We are reiterating our prior outlook expectations for organic tenant billings growth across all regions, including approximately 4.7% in the US and Canada, 11% to 12% in Africa, 5% to 6% in Europe and 2% in both LatAm and APAC, collectively driving approximately 5% for international and 5% on a consolidated basis. We will continue to assess our first quarter momentum as we work through the year.
Turning to Slide 9. We are increasing our adjusted EBITDA outlook by $40 million as compared to prior outlook, driven by the flow-through of the revised revenue reserve assumptions in India, partially offset by $5 million of FX headwinds.
Moving to Slide 10. We are similarly raising our expectations for AFFO attributable to common stockholders by $40 million at the midpoint and approximately $0.09 on a per share basis, moving the midpoint of $10.42, supported by the revised India reserve assumption benefits, partially offset by FX. As I mentioned, although we are raising expectations for interest expense, it is offset on a net basis by a similar increase in interest income.
Turning to Slide 11. We are reiterating our capital allocation plans for 2024 which is focused on selectively funding projects we expect to drive the most attractive risk-adjusted rates of return, sustained growth and quality of earnings executing on an accelerated pathway to balance sheet strength and financial flexibility and delivering an attractive total shareholder return profile as discussed on our Q4 2023 earnings call, this includes maintaining a relatively flat annual common dividend declaration of $6.48 per share or approximately $3 billion in 2024, with an expectation to resume growth again in 2025, all subject to Board approval.
Moving to the right side of the slide, our disciplined approach to capital allocation, together with recurring top line growth and its high conversion to profitability through cost management all support the progress we've made to achieving our goal of 5x net leverage by the end of the year, while our Q1 net leverage already stands at 5x, it is important to note that the metric for this quarter benefits from the Indian reserve reversals previously mentioned, and we'd expect to be above 5x in Q2. These efforts, combined with our successful capital markets execution year-to-date have further reinforced our investment-grade balance sheet as a strategic asset, which will remain a key focus moving forward.
Turning to Slide 12. And in summary, we are off to a great start to 2024. Our visibility into a solid foundation of recurring contracted growth across our global business combined with an accelerating pipeline supporting our expectations for future activity, a keen focus on cost discipline and margin expansion and a continued demonstration of strategically deploying capital while enhancing balance sheet strength gives us a high degree of confidence in our ability to drive strong, sustained growth over the long term for our shareholders while being a best-in-class operator for our stakeholders globally.
With that, operator, we can open the line for questions.