Using cryptocurrencies as a collateral to get a loan and buy real estate seems like a very risky and stupid idea to me.I don't know about websites,that accept crypto collateral for fiat loans.Do you know any?
1.Cryptocurrency prices might crash.You need a collateral that has a really stable price/value.
Getting a mortgage is a better option.
2.Everything in the real estate business is all about one thing-location.Buy a property at the wrong location and you are done with this business.Real estate isn't that easy and you will have to learn.