we have experienced disputes with customers and suppliers 2014such disputes may lead to increased tensions , damaged relationships or litigation which may result in the loss of a key customer or supplier . we have experienced certain conflicts or disputes with some of our customers and service providers . most of these disputes relate to the interpretation of terms in our contracts . while we seek to resolve such conflicts amicably and have generally resolved customer and supplier disputes on commercially reasonable terms , such disputes may lead to increased tensions and damaged relationships between ourselves and these entities , some of whom are key customers or suppliers of ours . in addition , if we are unable to resolve these differences amicably , we may be forced to litigate these disputes in order to enforce or defend our rights . there can be no assurances as to the outcome of these disputes . damaged relationships or litigation with our key customers or suppliers may lead to decreased revenues ( including as a result of losing a customer ) or increased costs , which could have a material adverse effect on us . our operations in australia expose us to changes in foreign currency exchange rates 2014we may suffer losses as a result of changes in such currency exchange rates . we conduct business in the u.s . and australia , which exposes us to fluctuations in foreign currency exchange rates . for the year ended december 31 , 2004 , approximately 7.5% ( 7.5 % ) of our consolidated revenues originated outside the u.s. , all of which were denominated in currencies other than u.s . dollars , principally australian dollars . we have not historically engaged in significant hedging activities relating to our non-u.s . dollar operations , and we may suffer future losses as a result of changes in currency exchange rates . internet access to reports we maintain an internet website at www.crowncastle.com . our annual reports on form 10-k , quarterly reports on form 10-q , and current reports on form 8-k ( and any amendments to those reports filed or furnished pursuant to section 13 ( a ) or 15 ( d ) of the securities exchange act of 1934 ) are made available , free of charge , through the investor relations section of our internet website at http://investor.crowncastle.com/edgar.cfm as soon as reasonably practicable after we electronically file such material with , or furnish it to , the securities and exchange commission . in addition , our corporate governance guidelines , business practices and ethics policy and the charters of our audit committee , compensation committee and nominating & corporate governance committees are available through the investor relations section of our internet website at http://investor.crowncastle.com/edgar.cfm , and such information is also available in print to any shareholder who requests it . item 2 . properties our principal corporate offices are located in houston , texas ; canonsburg , pennsylvania ; and sydney , australia . location property interest ( sq . ft. ) use .
about how many towers were leased or subleased in 2004?
in the u.s. , we also lease and maintain five additional regional offices ( called 201carea offices 201d ) located in ( 1 ) albany , new york , ( 2 ) alpharetta , georgia , ( 3 ) charlotte , north carolina , ( 4 ) louisville , kentucky and ( 5 ) phoenix , arizona . the principal responsibilities of these offices are to manage the leasing of tower space on a local basis , maintain the towers already located in the region and service our customers in the area . as of december 31 , 2004 , 8816 of the sites on which our u.s . towers are located , or approximately 83% ( 83 % ) of our u.s . portfolio , were leased , subleased or licensed , while 1796 or approximately 17% ( 17 % ) were owned in fee or through .