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How to manage 20 residential apartments
If he can't manage, best is he sells it off. Its easier to manage cash. Not sure what tax you are talking about. He should have already paid tax on fair market value of the 20 flats. If the intention of Mr X is to gift to son by way of death, then yes the tax will be less. Else whenever Mr X sells there will be tax.  how to manage these 20 apartments? Hire a broker. He may front run quite a few things like showing the place etc. There is a risk if he is given a free hand, he may not get good quality tenant. There are quite a few shark brokers [its unregulated] who may arm twist seeing the opportunity of an old man with 20 flats. See if you can do long term lease with companies looking for guest house etc, or certain companies who run guest house. They would like the scale, generally 3-5 years contracts are done. The rent is good and overall less hassle. The risk is most would ask to invest more in furnishing and contracts can be terminated in months notice. If the property is in large metro [Delhi/Bangalore/Chennai/etc] These places have good property management companies. Ensure that you have independent lawyer; there are certain aspects of law that may need to be studied.