walk-up

1. N-COUNT A walk-up is a tall apartment building that has no lift. You can also refer to an apartment in such a building as a walk-up. 无电梯的公寓大楼; 无电梯直通的公寓[美国英语]

She lives in a tiny fifth floor walk-up in New York's East Village. 她住在纽约东村一幢公寓楼5层的一间没有电梯直达的狭小公寓里。