In the past I think stuff like this has been illegal? but I think it could help housing market. You never would actually have to list a property for sale as such, you'd just visit this platform and in theory you'd see a range of offers currently on the table for your property (obviously subject to viewing). I know people have to survey a house etc etc. The purpose of the site/platform is purely for the intial meeting of potential seller and potential buyer - something estate agents charge for.
There are different ICO and project that already launched and done with the crowdsale, as i know there is ALTANT project that will be starting to list some properties this March of the present year. As blockchain is being so fast on rising, companies and project are targetting and creating new projects to improve the world in every aspect of the business. Real estate is one of the most popular business in the world that's why blockchain and ICO will not let that go.