Item 2. Properties
ITEM 2. PROPERTIES.
As of December 31, 2021, we leased approximately 3.6 million square feet of space in the U.S., including approximately 140 thousand square feet for our corporate headquarters in Boca Raton, Florida, primarily under long-term operating leases with third parties. We also own approximately 500 thousand square feet of space in the U.S.
Our properties primarily include our field locations and support centers. We have a network of over 250 sales and service offices and three regional distribution centers, which are supported by 17 multi-use sales, customer, and field support locations housing our nine UL-listed monitoring centers and four national sales centers. While select locations may primarily support one segment or market, such as our NAOC which supports our Commercial business, these multi-use locations primarily support our business as a whole.
We evaluate the suitability, adequacy, productive capacity, and utilization of our existing principal physical properties, including the evaluation of any impact from the COVID-19 Pandemic. During 2020, we implemented a temporary work from home strategy as a result of the COVID-19 Pandemic, and a portion of our employees continue to work from home under our temporary arrangement. The success of this initiative may allow us to transition some of our workforce to a permanent work from home environment, including a portion of our call center employees, which may result in changes to our physical property needs. As a result, we may be able to reduce our number of fixed physical locations, which we believe will reduce operating expenses while providing a significant benefit for our employees.
We continue to believe our properties are adequate and suitable for our business as presently conducted and are adequately maintained.
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