We've applied to YC a few months back with a real estate app based exactly on this premise. The goal was saving people's time and money in the inefficient home-search process.
Maybe, in the not so distant future, the use of VR in real estate will be to give everybody a seaview mansion when, in reality, they live within four boring walls.
Our project was mainly an operational effort rather than a technological one. We weren't to build any of the "core vr" technology, but to build an app upon the existing.
Taking a VR tour of a place is relatively easy. Taking a VR tour of every place is absolutely hard.
Turned down, though.