大楼

building (a relatively large, multistory one) / CL:幢[zhuang4],座[zuo4]

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

surname Lou

house with more than 1 story / storied building / floor / CL:層|层[ceng2],座[zuo4],棟|栋[dong4]

the Pentagon

skyscraper / CL:座[zuo4]

department store

apartment building

office building

World Trade Center (the twin towers destroyed by the 9-11 terrorists)