Sir,
With regards, to your query No.1, the Section 13(4) of IGST Act, 2017, which is applicable in your case and is as under :-
“13 (4) The place of supply of services supplied directly in relation to an immovable property, including services supplied in this regard by experts and estate agents, supply of accommodation by a hotel, inn, guest house, club or campsite, by whatever name called, grant of rights to use immovable property, services for carrying out or co-ordination of construction work, including that of architects or interior decorators, shall be the place where the immovable property is located or intended to be located”.
For query No.2 & 3, if you can elaborate your query, our experts may reply/comment, more specific to the facts.
Our experts may correct me if mistaken.
Thanks