The place of supply in relation to immovable property is the location of immovable property :

The place of supply in relation to immovable property is the location of immovable property. Suppose a road is constructed from Delhi to Mumbai covering multiple states. What will be the place of supply?

Ans. Where the immovable property is located in more than one State, the supply of service shall be treated as made in each of the States in proportion to the value for services separately collected or determined, in terms of the contract or agreement entered into in this regard or, in the absence of such contract or agreement, on such other reasonable basis as may be prescribed in this behalf. (The Explanation clause to section 12(3) of the IGST Act, for domestic
supplies)