since property is in Mumbai registration of gift deed has to be done in Mumbai only
2) it cannot be done in Pune
3) as per article 34 of Maharashtra stamp act only stamp duty of Rs 200 is leviable on transfer of property from mother to son by way of gift deed .
4) sub registrar would not ask you for payment of LBT s property is in Mumbai only
5) Sale consideration required to be invested in a residential house property and not commercial property
6) On sale of residential property, necessary to invest capital gains in another residential house property and not commercial property for exemption u/s 54.