Keystone Realtors Limited is an India-based real estate developer company, which operates under the brand Rustomjee. The Company provides various residential buildings, premium gated estates, townships, corporate parks, retail spaces, schools, iconic landmarks and various other real estate projects. It offers one bedroom, hall, and kitchen (BHK), two BHK, three BHK, four BHK, and five BHK. It has 32 completed projects, 12 ongoing projects and 19 forthcoming projects across the Mumbai Metropolitan Region (MMR). Its properties include Rustomjee Erika, Rustomjee Uptown Urbania, Rustomjee Bella, Rustomjee Elements, Rustomjee Urbania, Rustomjee Paramount, Rustomjee Summit, Rustomjee Seasons, Rustomjee Global City, Rustomjee Yazarina III, Rustomjee Garden 6, Rustomjee Crown, and Rustomjee Central Park Business Spaces.