What is the usable area of Lin 'an Park City125m2?

This can't be calculated simply from the building area.

Generally, the pool area of high-rise elevator buildings is about 20%; The pool area of high-rise apartment buildings is about 25%; The pool area of multi-storey houses (old houses without elevators) is about 10%, and the pool area of newly-built multi-storey elevator houses is about 15%.

All the above are approximate experience values.