2022 level and volatility of interest or capitalization rates or capital market conditions ; 2022 loss of hedge accounting treatment for interest rate swaps ; 2022 the continuation of the good credit of our interest rate swap providers ; 2022 price volatility , dislocations and liquidity disruptions in the financial markets and the resulting impact on financing ; 2022 the effect of any rating agency actions on the cost and availability of new debt financing ; 2022 significant decline in market value of real estate serving as collateral for mortgage obligations ; 2022 significant change in the mortgage financing market that would cause single-family housing , either as an owned or rental product , to become a more significant competitive product ; 2022 our ability to continue to satisfy complex rules in order to maintain our status as a reit for federal income tax purposes , the ability of the operating partnership to satisfy the rules to maintain its status as a partnership for federal income tax purposes , the ability of our taxable reit subsidiaries to maintain their status as such for federal income tax purposes , and our ability and the ability of our subsidiaries to operate effectively within the limitations imposed by these rules ; 2022 inability to attract and retain qualified personnel ; 2022 cyber liability or potential liability for breaches of our privacy or information security systems ; 2022 potential liability for environmental contamination ; 2022 adverse legislative or regulatory tax changes ; 2022 legal proceedings relating to various issues , which , among other things , could result in a class action lawsuit ; 2022 compliance costs associated with laws requiring access for disabled persons ; and 2022 other risks identified in this annual report on form 10-k including under the caption "item 1a . risk factors" and , from time to time , in other reports we file with the securities and exchange commission , or the sec , or in other documents that we publicly disseminate . new factors may also emerge from time to time that could have a material adverse effect on our business . except as required by law , we undertake no obligation to publicly update or revise forward-looking statements contained in this annual report on form 10-k to reflect events , circumstances or changes in expectations after the date on which this annual report on form 10-k is filed . item 1 . business . overview maa is a multifamily focused , self-administered and self-managed real estate investment trust , or reit . we own , operate , acquire and selectively develop apartment communities located in the southeast , southwest and mid-atlantic regions of the united states . as of december 31 , 2018 , we maintained full or partial ownership of apartment communities and commercial properties across 17 states and the district of columbia , summarized as follows: .
what is the percentage of unconsolidated units among the total units?
( 1 ) excludes commercial space located at our multifamily apartment communities , which totals approximately 615000 square feet of gross leasable space . our business is conducted principally through the operating partnership . maa is the sole general partner of the operating partnership , holding 113844267 op units , comprising a 96.5% ( 96.5 % ) partnership interest in the operating partnership as of december 31 , 2018 . maa and maalp were formed in tennessee in 1993 . as of december 31 , 2018 , we had 2508 full- time employees and 44 part-time employees. .