item 2 . properties our principal offices are located in boston , southborough and woburn , massachusetts ; atlanta , georgia ; cary , north carolina ; mexico city , mexico ; and sao paulo , brazil . details of each of these offices are provided below: .

Table:
location | function | size ( square feet ) | property interest
boston ma | corporate headquarters us tower division headquarters and american tower international headquarters | 19600 | leased
southborough ma | information technology data center | 13900 | leased
woburn ma | us tower division lease administration site leasing management and broadcast division headquarters | 57800 | owned ( 1 )
atlanta ga | us tower division accounting services headquarters | 21400 | leased
cary north carolina | us tower division new site development site operations and structural engineering services headquarters | 17500 | leased
mexico city mexico | mexico headquarters | 11000 | leased
sao paulo brazil | brazil headquarters | 5200 | leased
( 1 ) the facility in woburn contains a total of 163000 square feet of space .
approximately 57100 square feet of space is occupied by our lease administration office and our broadcast division , and we lease the remaining space to unaffiliated tenants .
in addition to the principal offices set forth above , we maintain 15 regional area offices in the united states through which we operate our tower leasing and services businesses .
we believe that our owned and leased facilities are suitable and adequate to meet our anticipated needs .
we have also established an office in delhi , india to pursue business opportunities in india and southeast asia , and we have an international business development group based in london , england .
our interests in our communications sites are comprised of a variety of ownership interests , including leases created by long-term ground lease agreements , easements , licenses or rights-of-way granted by government entities .
pursuant to the loan agreement for the securitization , the tower sites subject to the securitization are subject to mortgages , deeds of trust and deeds to secure the loan .
a typical tower site consists of a compound enclosing the tower site , a tower structure , and one or more equipment shelters that house a variety of transmitting , receiving and switching equipment .
there are three principal types of towers : guyed , self- supporting lattice , and monopole .
2022 a guyed tower includes a series of cables attaching separate levels of the tower to anchor foundations in the ground .
a guyed tower can reach heights of up to 2000 feet .
a guyed tower site for a typical broadcast tower can consist of a tract of land of up to 20 acres .
2022 a lattice tower typically tapers from the bottom up and usually has three or four legs .
a lattice tower can reach heights of up to 1000 feet .
depending on the height of the tower , a lattice tower site for a wireless communications tower can consist of a tract of land of 10000 square feet for a rural site or less than 2500 square feet for a metropolitan site .
2022 a monopole is a tubular structure that is used primarily to address space constraints or aesthetic concerns .
monopoles typically have heights ranging from 50 to 200 feet .
a monopole tower site of the kind typically used in metropolitan areas for a wireless communications tower can consist of a tract of land of less than 2500 square feet. .

Question: what portion of the woburn property owned by the american tower corporation is subleased?
Answer: 64.5%
Calculation: divide(163000, 57800), divide(#0, 163000)