A 5 BHK in Gurgaon is a limited segment, covering penthouses, large format floors and the top configurations in premium developments.
At this level each property is effectively unique, so market averages tell you nothing useful. Pricing is set by the specific floor, the view, the terrace allocation and how motivated the seller is. Comparable evidence is scarce, which means the negotiation matters far more than in any other configuration. Do not anchor on a rate per sq ft drawn from smaller units in the same building.
On penthouses and large format floors, confirm the terrace and service areas are included in the sale deed rather than granted informally. Confirm the maintenance charge, which at this size can be substantial. And establish how many comparable units exist in the corridor, because that number is your exit market.
It suits buyers who want the space and the address. As an investment it is illiquid, and exit depends on a small pool of buyers.
Many are, along with large format independent floors and the top configurations in premium developments.
It should be documented in the sale deed. Informal allocation of terrace area is a common source of dispute on resale.