Uncertainty is not helpful. If you subscribe to the YC style of startup landing pages (look at almost all YC companies), it is exceedingly clear what the website does in one sentence.
Examples:
Airbnb - Find a place to stay.
Picplum - Share Your Best Moments
Carwoo - Great New Car Deals
Referly - Recommend products you love
Then after that headline, they go into more detail:
Airbnb - Rent from people in 26,893 cities and 192 countries.
Picplum - Send photo prints to loved ones in seconds.
Carwoo - None Of The Games
Referly - And earn rewards when people buy them
Notice that in all of them, they have a great sentence in 4-6 key words, then a tagline that details what it does specifically. Regarding your comment elsewhere on this page "The reason is that I want to attract 'others' to my site- for future use". This is a bad idea. Focus on one thing and do it extremely well. The future will take care of itself. If you aren't able to get the real estate site to work now by being focused, then the future site won't matter.