v. Simple past tense and past participle of overbuild.
adj. Having had excessive construction performed on a building or in an area.
the GNU version of the Collaborative International Dictionary of English
adj. Having too many buildings.
Word Usage
"(He also says Philadelphia looks less bad than other places - for instance we're less 'overbuilt' - but he wouldn't go examples.) what we heard from Philadelphians who visited the Association for Corporate Growth"