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

upstairs; (Internet slang) previous poster in a forum thread

downstairs

stair; staircase; CL:個|个[ge4]

top of a building

upstairs; (Internet slang) previous poster in a forum thread

downstairs

stair; staircase; CL:個|个[ge4]

top of a building

floor; story (of a building)

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

to go upstairs

to go downstairs

garret; loft; attic

the Pentagon