Biggest changeThe following table summarizes operating data with respect to the Developed and Expanded Facilities: DEVELOPED AND EXPANDED FACILITIES Year Ended December 31, Year Ended December 31, 2022 2021 Change (a) 2021 2020 Change (a) ($ amounts in thousands, except for per square foot amounts) Revenues (b): Developed in 2017 $ 35,216 $ 27,593 $ 7,623 $ 27,593 $ 21,541 $ 6,052 Developed in 2018 36,789 28,308 8,481 28,308 20,163 8,145 Developed in 2019 16,444 11,921 4,523 11,921 6,455 5,466 Developed in 2020 6,838 3,405 3,433 3,405 301 3,104 Developed in 2021 8,333 1,602 6,731 1,602 — 1,602 Developed in 2022 687 — 687 — — — Expansions completed before 2021 95,029 70,091 24,938 70,091 47,886 22,205 Expansions completed in 2021 or 2022 51,374 33,746 17,628 33,746 29,333 4,413 Expansions in process 18,535 20,392 (1,857) 20,392 19,681 711 Total revenues 269,245 197,058 72,187 197,058 145,360 51,698 Cost of operations (b): Developed in 2017 10,416 9,932 484 9,932 9,625 307 Developed in 2018 10,742 9,983 759 9,983 10,364 (381) Developed in 2019 5,622 5,240 382 5,240 4,685 555 Developed in 2020 1,702 1,679 23 1,679 383 1,296 Developed in 2021 3,539 1,546 1,993 1,546 — 1,546 Developed in 2022 738 — 738 — — — Expansions completed before 2021 30,357 28,554 1,803 28,554 25,083 3,471 Expansions completed in 2021 or 2022 12,554 8,949 3,605 8,949 8,187 762 Expansions in process 3,796 4,146 (350) 4,146 4,544 (398) Total cost of operations 79,466 70,029 9,437 70,029 62,871 7,158 Net operating income (loss): Developed in 2017 24,800 17,661 7,139 17,661 11,916 5,745 Developed in 2018 26,047 18,325 7,722 18,325 9,799 8,526 Developed in 2019 10,822 6,681 4,141 6,681 1,770 4,911 Developed in 2020 5,136 1,726 3,410 1,726 (82) 1,808 Developed in 2021 4,794 56 4,738 56 — 56 Developed in 2022 (51) — (51) — — — Expansions completed before 2021 64,672 41,537 23,135 41,537 22,803 18,734 Expansions completed in 2021 or 2022 38,820 24,797 14,023 24,797 21,146 3,651 Expansions in process 14,739 16,246 (1,507) 16,246 15,137 1,109 Net operating income 189,779 127,029 62,750 127,029 82,489 44,540 Depreciation and amortization expense (63,362) (56,411) (6,951) (56,411) (48,573) (7,838) Net income $ 126,417 $ 70,618 $ 55,799 $ 70,618 $ 33,916 $ 36,702 40 DEVELOPED AND EXPANDED FACILITIES (Continued) As of December 31, As of December 31, 2022 2021 Change (a) 2021 2020 Change (a) ($ amounts in thousands, except for per square foot amounts) Square foot occupancy: Developed in 2017 89.3% 91.4% (2.3)% 91.4% 88.7% 3.0% Developed in 2018 87.5% 88.6% (1.2)% 88.6% 86.5% 2.4% Developed in 2019 87.3% 87.3% — 87.3% 84.6% 3.2% Developed in 2020 94.3% 88.9% 6.1% 88.9% 34.0% 161.5% Developed in 2021 82.4% 48.8% 68.9% 48.8% — — Developed in 2022 41.6% — — — — — Expansions completed before 2021 86.7% 86.6% 0.1% 86.6% 75.0% 15.5% Expansions completed in 2021 or 2022 80.0% 81.4% (1.7)% 81.4% 90.8% (10.4)% Expansions in process 81.8% 89.2% (8.3)% 89.2% 94.4% (5.5)% 84.1% 85.3% (1.4)% 85.3% 81.2% 5.0% Annual contract rent per occupied square foot: Developed in 2017 $ 19.77 $ 16.03 23.3% 16.03 12.64 26.8% Developed in 2018 20.84 17.08 22.0% 17.08 12.73 34.2% Developed in 2019 18.19 14.58 24.8% 14.58 9.69 50.5% Developed in 2020 21.75 17.67 23.1% 17.67 10.08 75.3% Developed in 2021 18.04 15.41 17.1% 15.41 — — Developed in 2022 13.84 — — — — — Expansions completed before 2021 16.17 13.64 18.5% 13.64 10.41 31.0% Expansions completed in 2021 or 2022 21.52 19.14 12.4% 19.14 18.19 5.2% Expansions in process 26.49 24.03 10.2% 24.03 21.87 9.9% $ 18.98 $ 16.08 18.0% 16.08 12.79 25.7% Number of facilities: Developed in 2017 16 16 — 16 16 — Developed in 2018 18 18 — 18 18 — Developed in 2019 11 11 — 11 11 — Developed in 2020 3 3 — 3 3 — Developed in 2021 6 6 — 6 — 6 Developed in 2022 8 — 8 — — — Expansions completed before 2021 51 51 — 51 51 — Expansions completed in 2021 or 2022 27 27 — 27 25 2 Expansions in process 13 13 — 13 13 — 153 145 8 145 137 8 Net rentable square feet (in thousands) (c): Developed in 2017 2,040 2,040 — 2,040 2,040 — Developed in 2018 2,069 2,069 — 2,069 2,069 — Developed in 2019 1,057 1,057 — 1,057 1,057 — Developed in 2020 347 347 — 347 347 — Developed in 2021 681 681 — 681 — 681 Developed in 2022 631 — 631 — — — Expansions completed before 2021 6,879 6,879 — 6,879 6,873 6 Expansions completed in 2021 or 2022 3,247 2,636 611 2,636 1,741 895 Expansions in process 749 897 (148) 897 961 (64) 17,700 16,606 1,094 16,606 15,088 1,518 41 As of December 31, 2022 Costs to develop (in thousands): Developed in 2017 $ 239,871 Developed in 2018 262,187 Developed in 2019 150,387 Developed in 2020 42,063 Developed in 2021 115,632 Developed in 2022 100,089 Expansions completed before 2021 (d) 478,659 Expansions completed in 2021 or 2022 (d) 231,270 $ 1,620,158 (a) Represents the percentage change with respect to square foot occupancy and annual contract rent per occupied square foot, and the absolute nominal change with respect to all other items.
Biggest changeThe following table summarizes operating data with respect to the Developed and Expanded Facilities: DEVELOPED AND EXPANDED FACILITIES Year Ended December 31, Year Ended December 31, 2023 2022 Change (a) 2022 2021 Change (a) ($ amounts in thousands, except for per square foot amounts) Revenues (b): Developed in 2018 $ 40,206 $ 36,789 $ 3,417 $ 36,789 $ 28,308 $ 8,481 Developed in 2019 18,081 16,444 1,637 16,444 11,921 4,523 Developed in 2020 7,621 6,838 783 6,838 3,405 3,433 Developed in 2021 11,134 8,333 2,801 8,333 1,602 6,731 Developed in 2022 6,893 687 6,206 687 — 687 Developed in 2023 1,032 — 1,032 — — — Expansions completed before 2022 138,629 127,290 11,339 127,290 88,168 39,122 Expansions completed in 2022 or 2023 27,698 20,914 6,784 20,914 20,400 514 Expansions in process 11,156 13,704 (2,548) 13,704 13,315 389 Total revenues 262,450 230,999 31,451 230,999 167,119 63,880 Cost of operations (b): Developed in 2018 11,662 10,742 920 10,742 9,983 759 Developed in 2019 5,608 5,622 (14) 5,622 5,240 382 Developed in 2020 1,884 1,702 182 1,702 1,679 23 Developed in 2021 3,849 3,539 310 3,539 1,546 1,993 Developed in 2022 3,563 738 2,825 738 — 738 Developed in 2023 1,638 — 1,638 — — — Expansions completed before 2022 38,885 37,502 1,383 37,502 32,945 4,557 Expansions completed in 2022 or 2023 9,644 5,805 3,839 5,805 5,370 435 Expansions in process 1,798 2,155 (357) 2,155 2,127 28 Total cost of operations 78,531 67,805 10,726 67,805 58,890 8,915 Net operating income (loss): Developed in 2018 28,544 26,047 2,497 26,047 18,325 7,722 Developed in 2019 12,473 10,822 1,651 10,822 6,681 4,141 Developed in 2020 5,737 5,136 601 5,136 1,726 3,410 Developed in 2021 7,285 4,794 2,491 4,794 56 4,738 Developed in 2022 3,330 (51) 3,381 (51) — (51) Developed in 2023 (606) — (606) — — — Expansions completed before 2022 99,744 89,788 9,956 89,788 55,223 34,565 Expansions completed in 2022 or 2023 18,054 15,109 2,945 15,109 15,030 79 Expansions in process 9,358 11,549 (2,191) 11,549 11,188 361 Net operating income 183,919 163,194 20,725 163,194 108,229 54,965 Depreciation and amortization expense (61,421) (54,115) (7,306) (54,115) (47,549) (6,566) Net income $ 122,498 $ 109,079 $ 13,419 $ 109,079 $ 60,680 $ 48,399 41 DEVELOPED AND EXPANDED FACILITIES (Continued) As of December 31, As of December 31, 2023 2022 Change (a) 2022 2021 Change (a) ($ amounts in thousands, except for per square foot amounts) Square foot occupancy: Developed in 2018 86.7% 87.5% (0.9)% 87.5% 88.6% (1.2)% Developed in 2019 84.6% 87.3% (3.1)% 87.3% 87.3% —% Developed in 2020 89.4% 94.3% (5.2)% 94.3% 88.9% 6.1% Developed in 2021 81.5% 82.4% (1.1)% 82.4% 48.8% 68.9% Developed in 2022 77.7% 43.6% 78.2% 43.6% —% —% Developed in 2023 27.9% —% —% —% —% —% Expansions completed before 2022 86.4% 87.0% (0.7)% 87.0% 85.0% 2.4% Expansions completed in 2022 or 2023 70.4% 71.4% (1.4)% 71.4% 84.8% (15.8)% Expansions in process 63.4% 86.2% (26.5)% 86.2% 96.5% (10.7)% 79.3% 83.4% (4.9)% 83.4% 84.4% (1.2)% Annual contract rent per occupied square foot: Developed in 2018 $ 21.32 $ 20.84 2.3% $ 20.84 $ 17.08 22.0% Developed in 2019 18.83 18.19 3.5% 18.19 14.58 24.8% Developed in 2020 22.73 21.75 4.5% 21.75 17.67 23.1% Developed in 2021 19.78 18.04 9.6% 18.04 15.41 17.1% Developed in 2022 16.20 13.84 17.1% 13.84 — —% Developed in 2023 9.61 — —% — — —% Expansions completed before 2022 18.36 17.89 2.6% 17.89 14.92 19.9% Expansions completed in 2022 or 2023 18.88 18.72 0.9% 18.72 18.19 2.9% Expansions in process 28.66 30.93 (7.3)% 30.93 28.29 9.3% $ 18.67 $ 18.37 1.6% $ 18.37 $ 15.65 17.4% Number of facilities: Developed in 2018 18 18 — 18 18 — Developed in 2019 11 11 — 11 11 — Developed in 2020 3 3 — 3 3 — Developed in 2021 6 6 — 6 6 — Developed in 2022 8 8 — 8 — 8 Developed in 2023 11 — 11 — — — Expansions completed before 2022 61 61 — 61 61 — Expansions completed in 2022 or 2023 22 22 — 22 22 — Expansions in process 5 5 — 5 5 — 145 134 11 134 126 8 Net rentable square feet (in thousands): Developed in 2018 2,069 2,069 — 2,069 2,069 — Developed in 2019 1,057 1,057 — 1,057 1,057 — Developed in 2020 347 347 — 347 347 — Developed in 2021 681 681 — 681 681 — Developed in 2022 631 631 — 631 — 631 Developed in 2023 1,098 — 1,098 — — — Expansions completed before 2022 8,390 8,382 8 8,382 8,413 (31) Expansions completed in 2022 or 2023 2,353 1,771 582 1,771 1,216 555 Expansions in process 475 428 47 428 490 (62) 17,101 15,366 1,735 15,366 14,273 1,093 42 As of December 31, 2023 Costs to develop (in thousands): Developed in 2018 $ 262,187 Developed in 2019 150,387 Developed in 2020 42,063 Developed in 2021 115,632 Developed in 2022 100,089 Developed in 2023 193,766 Expansions completed before 2022 (c) 506,594 Expansions completed in 2022 or 2023 (c) 268,449 $ 1,639,167 (a) Represents the percentage change with respect to square foot occupancy and annual contract rent per occupied square foot, and the absolute nominal change with respect to all other items.
Over the long term, to the extent that our cash requirements exceed our capital resources, we believe we have a variety of possibilities to raise additional capital including issuing common or preferred securities, issuing debt, or entering into joint venture arrangements to acquire or develop facilities. 47 Cash Requirements The following summarizes our expected material cash requirements, which comprise (i) contractually obligated expenditures, including payments of principal and interest, (ii) other essential expenditures, including property operating expenses, maintenance capital expenditures and dividends paid in accordance with REIT distribution requirements, and (iii) opportunistic expenditures, including acquisitions and developments and repurchases of our securities.
Over the long term, to the extent that our cash requirements exceed our capital resources, we believe we have a variety of possibilities to raise additional capital including issuing common or preferred securities, debt, and limited partnership interests, or entering into joint venture arrangements to acquire or develop facilities. 49 Cash Requirements The following summarizes our expected material cash requirements, which comprise (i) contractually obligated expenditures, including payments of principal and interest, (ii) other essential expenditures, including property operating expenses, maintenance capital expenditures and dividends paid in accordance with REIT distribution requirements, and (iii) opportunistic expenditures, including acquisitions and developments and repurchases of our securities.
The facilities under “expansion in process” represent those facilities where construction is in process at December 31, 2022, and together with additional future expansion activities primarily related to our Same Store Facilities at December 31, 2022, we expect to add a total of 2.5 million net rentable square feet of storage space by expanding existing self-storage facilities for an aggregate direct development cost of $487.3 million. 42 Other Non-Same Store Facilities The “Other Non-Same Store Facilities” represent facilities which, while not newly acquired, developed, or expanded, are not fully stabilized since January 1, 2020, including facilities undergoing fill-up as well as facilities damaged in casualty events such as hurricanes, floods, and fires.
The facilities under “expansion in process” represent those facilities where construction is in process at December 31, 2023, and together with additional future expansion activities primarily related to our Same Store Facilities at December 31, 2023, we expect to add a total of 1.3 million net rentable square feet of storage space by expanding existing self-storage facilities for an aggregate direct development cost of $304.8 million. 43 Other Non-Same Store Facilities The “Other Non-Same Store Facilities” represent facilities which, while not newly acquired, developed, or expanded, are not fully stabilized since January 1, 2021, including facilities undergoing fill-up as well as facilities damaged in casualty events such as hurricanes, floods, and fires.
We also present “Core FFO” and “Core FFO per share” non-GAAP measures that represent FFO and FFO per share excluding the impact of (i) foreign currency exchange gains and losses, (ii) charges related to the redemption of preferred securities, and (iii) certain other non-cash and/or nonrecurring income or expense items primarily representing, with respect to the periods presented below, the impact of loss contingency accruals and casualties, unrealized gain on private equity investments and our equity share of merger transaction costs, severance of a senior executive, lease termination income, and casualties from our equity investees .
We also present “Core FFO” and “Core FFO per share” non-GAAP measures that represent FFO and FFO per share excluding the impact of (i) foreign currency exchange gains and losses, (ii) charges related to the redemption of preferred securities, and (iii) certain other non-cash and/or nonrecurring income or expense items primarily representing, with respect to the periods presented below, the impact of loss contingency accruals and resolutions, casualties, due diligence costs incurred in pursuit of strategic transactions, unrealized gain on private equity investments, UPREIT reorganization costs, Simply integration costs, amortization of acquired non real estate-related intangibles from the Simply Acquisition and our equity share of deferred tax benefits of a change in tax status, merger transaction costs, severance of a senior executive, lease termination income, and casualties from our equity investees.
The Other Non-Same Store Facilities have an aggregate of 5.7 million net rentable square feet, including 1.1 million in Texas, 0.6 million in each of Florida and Washington, 0.4 million in each of California and Virginia, 0.3 million in each of Indiana and South Carolina, 0.2 million in each of Arizona, Georgia, Kentucky, Massachusetts, and Tennessee, and 1.0 million in other states.
The Other Non-Same Store Facilities have an aggregate of 7.3 million net rentable square feet, including 1.3 million in Texas, 0.5 million in Pennsylvania, 0.4 million in each of California, Florida, Illinois, Michigan, Minnesota, Ohio, and Washington, 0.3 million in each of Arizona, Georgia, and South Carolina, 0.2 million in each of Alabama, Colorado, Missouri, and Virginia, and 1.0 million in other states.
The following table sets forth our ancillary operations: Year Ended December 31, 2022 2021 Change (Amounts in thousands) Revenues: Tenant reinsurance premiums $ 188,201 $ 166,585 $ 21,616 Merchandise 28,303 28,466 (163) Third party property management 19,631 17,207 2,424 Total revenues 236,135 212,258 23,877 Cost of operations: Tenant reinsurance 36,830 33,932 2,898 Merchandise 17,113 17,274 (161) Third party property management 18,755 17,362 1,393 Total cost of operations 72,698 68,568 4,130 Net operating income (loss): Tenant reinsurance 151,371 132,653 18,718 Merchandise 11,190 11,192 (2) Third party property management 876 (155) 1,031 Total net operating income $ 163,437 $ 143,690 $ 19,747 Tenant reinsurance operations: Tenant reinsurance premium revenue increased $21.6 million or 13.0% in 2022 over 2021, as a result of an increase in our tenant base with respect to acquired, newly developed, and expanded facilities and the third party properties we manage.
The following table sets forth our ancillary operations: Year Ended December 31, 2023 2022 Change (Amounts in thousands) Revenues: Tenant reinsurance premiums $ 203,503 $ 188,201 $ 15,302 Merchandise 27,511 28,303 (792) Third party property management 27,063 19,631 7,432 Total revenues 258,077 236,135 21,942 Cost of operations: Tenant reinsurance 42,366 36,830 5,536 Merchandise 17,137 17,113 24 Third party property management 26,493 18,755 7,738 Total cost of operations 85,996 72,698 13,298 Net operating income: Tenant reinsurance 161,137 151,371 9,766 Merchandise 10,374 11,190 (816) Third party property management 570 876 (306) Total net operating income $ 172,081 $ 163,437 $ 8,644 Tenant reinsurance operations: Tenant reinsurance premium revenue increased $15.3 million or 8.1% in 2023 over 2022, as a result of an increase in our tenant base with respect to acquired, newly developed, and expanded facilities and the third party properties we manage, as well as the increase of tenant insurance participation at our same store facilities.