Your aunt can execute a power of attorney before the Indian Embasy in the country where she resides and thereafter forward such power of attorney to your mother and who in turn can then have such POA adjudicated and pay stamp duty thereon and further have the same notarise before a notary public.
The process for buying of properties by an NRI is same as that for resident Indians. The procedure for foreign nationals is differnet and requires permission of the RBI.
The right to admit execution of a document before the registration authorities can be granted to someone by way of a Power of Attorney. An NRI can execute such Power of Attorney before the Indian embassy at the place where such NRI resides and forward such Power of Attorney to India for adjudication and payment of stamp duty and thereafter, such Power of Attorney can be used to admit execution ...
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The property is situtated in India and therefore capital gains tax will arise on this transaction. The buyer will have to deduct TDS as per provisions of section 195 of the Income Tax Act since you are NRI.
No harm in buying property in the manner suggested by you. There would not be captial tax implications if the property you intend to be is residential property and if all gains from selling of the earlier property are invested in buying of the new residential property .
Since there is balance amount to be paid under the agreement with the Builder, the NOC from the Builder will be required for concluding the sale. However, the Builder cannot demand the balance 20% amount if it is not due, merely because the buyer desires to sell the flat.
Under the provisions of the Maharashtra Rent Control Act, 1999, a sepcial authority has been constituted to deal with the cases relating to disputes between a licensor and licensee in respect of residential properties with a mandate to decide such cases within a period of 6 months.