soft-story
adj.— «City officials have decided to speed an analysis of what to do about so-called soft-story buildings because the wood-frame structures are ubiquitous in San Francisco – possibly numbering in the tens of thousands – and probably represent a greater risk simply because of their numbers.» —“S.F.‘s concrete buildings also a quake danger” by Robert Selna San Francisco Chronicle (California) July 27, 2008. (source: Double-Tongued Dictionary)