Added some properties and validations to RealEstate model
Added some properties and validations to RealEstate model

Team-13-End-to-End-JS/End-To-End-JS,Team-13-End-to-End-JS/End-To-End-JS,Team-13-End-to-End-JS/End-To-End-JS,Team-13-End-to-End-JS/End-To-End-JS