The construction cost is still being formulated, but similar class A buildings have gone up for $225 per sf. "Right now we're planning twin buildings, with the first phase at around 350,000," says Carleton Riser, Transwestern's managing director. The twins will sit on 21 acres at Eldridge and Enclave parkways near the 878-acre Enclave corporate office park. "If it's a build-to-suit, the project could be designed and sited differently," Riser adds. Houston-based Kirksey Architecture is designing the twin-tower development.

Riser tells GlobeSt.com that the current plan for Transwestern and its institutional partner is to build it, lease it and sell it. He doesn't anticipate much of a lease-up problem, particularly in a submarket that has become attractive to major energy companies, their subsidiaries and their venders.

"Space in the Energy Corridor is very tight," Riser points out. "The class A vacancy rate is less than 5%." Added to that, he says the area is a controlled environment from a development perspective, partly due to wetlands issues.