Houstonian Properties is the Top Realtor and Best Real Estate Brokerage Firm in Houston. Our brokerage firm has over 23 years of professional experience. Call us today (713) 934-9599. Houstonian Properties has grown to become one of the best real estate brokerage firm in Houston. While excelling in professional real estate services for over 23 years, owner Therese Landa has sold over 1,000 homes. Her extensive knowledge and savvy approach makes her one of the best Realtors in Houston, Texas.