An office complex that will fill the final tract of undeveloped land in the Senna Hills neighborhood is currently undergoing the city of Austin permitting process. The plan is to build three buildings at about 50,000 square feet each, according to Developer Rip Miller, whose past projects include the Westlake Medical Center Ltd., the Oceana Beach and Wildlife Reserve C.C, the Miller Consulting Group and Mesa Plaza Ltd. The office buildings will be two stories, have underground parking and face different directions, Miller said of the preliminary design. The number of businesses that will fill the space has not been determined. “There could be one company in one building or many; it depends on the market,” Miller said. The Senna Hills Homeowners Association and Senna Hills Municipal Utility District approved Miller’s building plans in March. “This project is something we’ve been working on with the Senna Hills HOA for four or five years to make sure everyone is in agreement with what’s going to be there,” Miller said. “I have a lot invested in [the neighborhood] from a personal standpoint.” Miller was also behind development of the Senna Hills neighborhood, which began in 1994. The neighborhood has about 410 homes. “The biggest benefit is that this [project] will add value to the tax base,” Miller said. The complex will also include a community room for holding conferences or luncheons. The room will be available to Senna Hills residents as well as office tenants. It will take about a year to get through the city of Austin’s permitting process, Miller estimated.