Mike Mas
Executive Vice President and Chief Financial Officer at Regency Centers
Thanks, Jim. Good morning, everyone. I'll provide some color around third quarter results, walk through the changes to full year 2021 guidance and offer some helpful reminders when thinking about next year. Third quarter Nareit FFO of $1.12 per share was helped by several items. Uncollectible lease income was a positive $10 million in the quarter, the details of which we've broken out on Page 33 of our supplemental. We reserved over $4 million on third quarter billings, which is down from over $10 million a quarter ago, associated with uncollected revenues from cash basis tenants. This was more than offset by the collection of nearly $6 million of amounts reserved during the first half of 2021, as well as the collection of close to $9 million of revenues that were originally reserved in 2020.
Our full year '21 guidance calls for a $46 million positive impact from the collection of 2020 reserves, of which we have recognized $41 million through the third quarter. We also recognized close to $14 million of one-time promote income in the third quarter related to the USAA JV transaction, which positively impacted Nareit FFO, but is not included in our core operating earnings metric. Finally, straight-line rent in the third quarter benefited from the reversal of reserves triggered by the conversion of some cash basis tenants back to accrual accounting. As reflected in uncollectible straight-line rent at a positive $4 million. This is a non-cash accounting impact that contributes to Nareit FFO, but again, did not impact our core operating earnings.
Following these conversions, which represent about 5% of ABR, we now have 22% of our ABR remaining on a cash basis of accounting. For the smaller pool, our cash basis collection rate was 91% in the third quarter, a 700 basis point increase from a quarter ago. The collection rate on the old pool before the conversion was 93% in the third quarter up from the 86% in the second quarter that we disclosed on the last call. As Jim mentioned, our net effective rent paying occupancy now exceeds 90% as we've continued to narrow the spread between rent paying and our commenced occupancy rate due to the progress we've made increasing collections on cash basis tenants.
We remain in a great position from a balance sheet perspective as cash flows continue to recover and leverage even after excluding prior year reserve collections, has returned to pre-pandemic levels. We ended the quarter with full capacity on our revolver and we have no unsecured debt maturities until 2024. You'll recall that we issued about $150 million of equity in Q2 through our ATM program on a forward basis. We settled a portion of that during the third quarter to fund the USAA transaction generating $83 million of net proceeds. The remainder is unsettled, which we view as capacity for future investment opportunities. And we have until June of 2022 to issue the shares. We did not raise any additional equity capital during the third quarter.
Turning to guidance, we point you to the detail on our business update slide deck posted to our website. A big driver of the $0.12 increase in the midpoint of our core operating earnings range comes from a higher same-property NOI growth forecast as we increased the range by a 150 basis points at the midpoint. This increase was driven almost entirely by core improvement, including a higher cash basis collection rate on current year billings and lower move-out activity. As I mentioned, our forecast for the collection of prior year 2020 reserves is up only slightly at $46 million.
Other drivers of the increase to full year core operating earnings expectations include higher lease termination fees and lower G&A. Our Nareit FFO range has increased by an additional $0.05 at the midpoint on top of the change I just described, primarily driven by the increase in straight-line rent associated with the conversion of tenants back to accrual from cash basis during the third quarter. While it's possible that we may convert additional tenants back to accrual during the fourth quarter, our guidance does not assume any additional reversal of straight-line rent reserves.
I'd like to point out that these non-cash accounting impacts are a big reason why we provide and guide to core operating earnings in addition to Nareit FFO. This metric excludes non-cash amounts such as straight-line rent and mark-to-market adjustments and can provide a much cleaner picture of our earnings trajectory. We will provide 2022 guidance with Q4 results in February as we normally do, but we wanted to remind everyone that some of the bigger nonrecurring moving pieces that have been disclosed and discussed throughout the year when thinking about modeling for next year.
First, our $46 million guidance for collection of 2022 reserves is a prior period adjustment, not associated with 2021 billings. Second, we recognize that normally high expense recoveries of about $3.5 million net of reserves in the second quarter related to the 2020 expense reconciliation process. Third, G&A during the first quarter benefited by about $2 million from the forfeiture of previously expense share grant related to the departure of our CIO earlier this year. And lastly, although not impacting core operating earnings, we recognized close to $14 million of promote income in the third quarter.
We look forward to discussing our 2022 outlook in more detail together with next quarter's results. As Lisa mentioned, given the pace of improvement we have experienced to this point of the year, we now expect the recovery of our NOI back to 2019 levels, will occur on an annualized basis at some point during the first half of next year. That's about six months earlier than we had previously expected.
With that, we look forward to taking your questions.