Land for Sale with Approved Plans to Build a Duplex. RTI. Bring your offer. Seller is very motivated. This is a vacant lot zoned R-2 that has approved plans to build a duplex. Each unit will be 1,400 square feet with a 420 square foot garage. The lot is located in a quiet, family-friendly neighborhood with easy access to schools, shopping, and restaurants. This is an excellent opportunity for an investor or a developer to build a duplex and generate income. The duplex could be rented out to tenants or sold as a single-family home.