David Simon
Chairman of the Board, Chief Executive Officer and President at Simon Property Group
Good evening from Phipps Plaza where we recently completed our transformation, including a new office building, a new Nobu Hotel and a Life Time resort. I'm pleased to report our fourth quarter and full year results. We generated approximately $4.5 billion in FFO in 2022, or $11.95 per share. On a comparable basis, full year FFO per share was $11.87, an increase of 3.8% year-over-year.
We returned approximately $2.8 billion to shareholders in dividends and share. And total dividends today we paid since our IPO now totals approximately $39 billion. We invested approximately $1 billion, including accretive development projects and expanding our other investment platform into the growing asset and investment management businesses with our Jamestown partnership. These consistent strong results are a testament to the quality of our portfolio, our relentless focus on operational and cost structure, disciplined capital allocation and our team's commitment to our shoppers and communities.
The fourth quarter funds from operations were $1.27 billion or $3.40 per share. Included in the fourth quarter results was a net gain of $0.25 per share, principally from the sale of our interest in the Eddie Bauer licensing JV and exchange for additional equity ownership in Authentic Brands Group. We now own 12% of Authentic valued at approximately $1.5 billion.
Let me walk through some variances for this quarter compared to Q4 of 2021. Our domestic operations had a very good quarter and contributed $0.23 of growth, driven primarily by higher rental income and with some lower operating expenses. These positive contributions were partially offset by higher interest expense of $0.03 at a $0.15 lower contribution from our other platform investments. 2021 was a great year for our retailers. However, in 2022, Forever 21 and JCPenney were affected by inflationary pressures and consumers reducing their spend, despite not achieving the same profitability that we did in 2021, we are pleased on how we and the management teams dealt with beyond the anticipated external environment.
Turning to domestic property NOI, we increased 5.8% year-over-year for the quarter and 48% for the year. Portfolio NOI, which includes our international properties at constant currency, grew 6.3% for the quarter and 5.7% for the year. Occupancy for malls and outlet at the end of the fourth quarter was 94.9%, an increase of 150 basis points compared to prior year and an increase of 40 basis points sequentially. The Mills occupancy was 98.2% and TRG was 94.5%. Average base minimum rent was $55.13 per foot, an increase 2.3% year-over-year. For the year, we signed 4,100 leases for more than 14 million square feet. Over two years, we've now signed 8,000 leases for more than 29 million square feet, and we have a significant number of leases in our pipeline that will open for a late 2023 and 2024 openings.
Reported retailer sales momentum continued. We reached another record in the fourth quarter at $753 per square foot, with the malls and outlets combined, an increase of 6.6% year-over-year. All platforms achieved record sales levels, including The Mills at $679 per square-foot, which was a 5% increase; TRG was at $1,095 per square foot, a 11% increase; and our occupancy at the end of the fourth quarter was 12%.
We opened a new development in 2022, our 10th Premium Outlet in Japan. Construction continues on new outlet in Normandy, France, west of Paris. This will be our second outlet in France and our 35th international outlet. Our international outlet platform is a hidden jewel for SPG. As a frame of reference, it is bigger and much more profitable with much higher sales per square foot than another public company's portfolio. We completed 14 redevelopments and we will complete another major redevelopment project this year at some of our most productive properties. In addition, we expect to begin construction this year on six to eight mixed-use projects, all of this will be funded with our internally generated cash flow.
Now turning to other platform investments. In the fourth quarter, it contributed $0.23 per share in FFO as compared to $0.38 in the prior year period. For the year, OPI contributed $0.64 in FFO compared to $1.07 in the prior year. We are pleased with the contribution from our OPI investments, especially given our de-minimis cash investment we've made in these companies.
Turning to the balance sheet. We completed refinancing on 20 property mortgages for a total of $2.3 billion at an average interest rate of 5.33%. Our A-rated balance sheet is as strong as ever. Our fixed coverage ratio is 4.8 times, and we ended the year with approximately $7.8 billion of liquidity. In 2022, we paid approximately $2.6 billion in common stock dividends in cash. We announced $1.80 per share this quarter, which is a 9% increase over the same period last year. The dividend is payable at the end of March -- at the end of this quarter on March 31. We also repurchased 1.8 million shares of our common stock at an average purchase price of $98.57 in 2022.
Moving on to '23. Our comparable FFO guidance is $11.70 to $11.95 per share. Our guidance reflects the following assumptions: domestic property NOI growth of at least 2%, increased interest expense compared to 2022 of approximately $0.30 to $0.35 per share, reflecting current market interest rates on both fixed and variable debt assumptions similar OPI investment contribution, FFO contribution compared to 2022, the continuing impact of the strong US dollar versus the euro and the yen, no significant acquisition or disposition activity and a diluted share count of approximately 374 million shares.
To conclude, we had another excellent year, effectively navigating external headwinds that included rising interest rates, strong US dollars, inflation and a somewhat softening economy. We have consistently posted industry-leading results through our hard work, innovation, great people and great assets, and we continue to be excited about our plans for 2023. If you come to Atlanta, you will see what we're doing, and it's a great example of the future growth prospects of our company.
And we'll now allow for Q&A. Thank you.