英语翻译The residential buildings that have open spaces in thefi

英语翻译
The residential buildings that have open spaces in the
first stories are in great demand especially in urban areas.
Architecturally it is very reasonable to allot such open
spaces for parking lots and so on.As a result,the first
stories become soft and weak relative to the other upper
stories,since the first stories are composed of only the
columns although the residential stories are divided by
the rigid walls.Structurally those unbalances are
unhealthy,and the soft-first-story buildings are well
known for being susceptible to collapse through past big
earthquakes.