December 31, 2019. References to our statements of operations refer to our condensed consolidated statements of operations for the three and nine months ended September 30, 2020 and 2019. References to our statements of cash flows refer to our condensed consolidated statements of cash flows for the nine months ended September 30, 2020 and 2019.
The accompanying financial statements are prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"), which requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosures of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from these estimates.
We have elected to be taxed as a REIT under sections 856-860 of the Internal Revenue Code of 1986, as amended (the "Code"). Under those sections, a REIT which distributes at least 90% of its REIT taxable income as dividends to its shareholders each year and which meets certain other conditions will not be taxed on that portion of its taxable income which is distributed to its shareholders. We intend to adhere to these requirements and maintain our REIT status in future periods. We also participate in the activities conducted by subsidiary entities which have elected to be treated as taxable REIT subsidiaries under the Code. As such, we are subject to federal, state and local taxes on the income from these activities.
We aggregate our operating segments into three reportable segments (commercial, multifamily, and third-party asset management and real estate services) based on the economic characteristics and nature of our assets and services.
Our revenues and expenses are, to some extent, subject to seasonality during the year, which impacts quarterly net earnings, cash flows and funds from operations that affects the sequential comparison of our results in individual quarters over time. For instance, we have historically experienced higher utility costs in the first and third quarters of the year.
We compete with a large number of property owners and developers. Our success depends upon, among other factors, trends affecting national and local economies, the financial condition and operating results of current and prospective tenants, the availability and cost of capital, interest rates, construction and renovation costs, taxes, governmental regulations and legislation, population trends, zoning laws, and our ability to lease, sublease or sell our assets at profitable levels. Our success is also subject to our ability to refinance existing debt on acceptable terms as it comes due.
Overview
As of September 30, 2020, our Operating Portfolio consisted of 64 operating assets comprising 43 commercial assets totaling 13.3 million square feet (11.2 million square feet at our share) and 21 multifamily assets totaling 7,800 units (5,999 units at our share). Additionally, we have (i) two under-construction assets comprising one wholly owned commercial asset totaling 274,000 square feet and one multifamily asset totaling 322 units (161 units at our share); (ii) 10 wholly owned near-term development assets totaling 5.6 million square feet of estimated potential development density; and (iii) 28 future development assets totaling 14.2 million square feet (11.5 million square feet at our share) of estimated potential development density. During the second quarter, we modified the definition of near-term development assets in our disclosures to include select projects that will be in a position to start construction over the next three years, subject to receipt of full entitlements and market conditions.
Since mid-2017, we have been focused on a comprehensive plan to reposition our holdings in National Landing in Northern Virginia through a broad array of Placemaking strategies. Our Placemaking strategies include the delivery of new multifamily and office developments, locally sourced amenity retail, and thoughtful improvements to the streetscape, sidewalks, parks and other outdoor gathering spaces. In keeping with our dedication to Placemaking, each new project is intended to contribute to authentic and distinct neighborhoods by creating a vibrant street environment with a robust offering of amenity retail and improved public spaces.
In November 2018, Amazon.com, Inc. ("Amazon") announced it had selected sites that we own in National Landing as the location of an additional headquarters. To date, we have executed leases with Amazon totaling approximately 857,000 square feet at five office buildings in our National Landing portfolio. In March 2019, we executed purchase and sale agreements with Amazon for two of our National Landing development sites, Metropolitan Park and Pen Place, which will serve as the initial phase of new construction associated with Amazon's new headquarters at National Landing. Subject to