9. Can a property transaction be done by someone on owner’s behalf?

Yes. Though Power Of Attorney subject to eligibility of POA holder and POA content.
 
For all practical purposes, you can give a specific power of attorney to someone, so that in your absence, things like registration, possession, execution of agreement for sale, agreement of leave and license etc, can be taken care. You can give a very specific POA to someone e.g. only for buying, or leasing, etc. you could fine tune the rights you would like to give out and clear that up

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