There are many buildings constructed with surplus space, so if particularly large housing demand occurs in one area, it is possible to cover construction funds by building additional storys and selling them; however, for some danchi, rebuilding is problematic partly because housing demand is very limited with little prospect of profitability and partly because that danchi has used full floor-area ratio and there is no space remaining
容積率に余裕を持って建てられているものが多いので、住宅需要の高い地域であれば、高層化を行って戸数を増やし、増えた分の住戸を売却して建設資金をまかなう、という手法も可能であるが、住宅需要が乏しい地域で採算の見込めない団地、あるいは既に容積率いっぱいに建てている団地の場合は建て替えが困難になっている例もある。