Crux Subsurface Inc., the Spokane Valley-based geotechnical exploration and construction company, plans to move from the Spokane Business & Industrial Park to a larger building in the Spokane Valley that an affiliated company has bought and is improving.

Mark Neupert, Crux vice president of business development, says Garco Construction Inc., of Spokane, is the design-build contractor that is remodeling the 49,500-square-foot structure at 4308 N. Barker for Crux's new headquarters. NAC|Architecture, of Spokane, did some preliminary design work for the remodel.

The company plans to move there Sept. 1 from 16707 E. Euclid, where it's leasing a 20,000-square-foot building and a nearby 4,500-square-foot structure.

"The property sits on a 10-acre lot, so we'll have quite a lot of yard space," Neupert says.

Spokane Valley-based Subsurface Investment Partners LLC, an affiliate company that includes Crux co-founder Nick Salisbury as a managing partner, bought the vacant building on Barker Road in January for $2.6 million, Neupert says.

The city of Spokane Valley lists the remodel project value at $700,000.

The structure previously was occupied by Sunrise Wood Products, a subsidiary of Oregon-based Lumber Products Inc., which filed for bankruptcy in 2012.

Neupert says Crux will lease the building on Barker Road from Subsurface Investment Partners, which is investing in the tenant improvements.

Crux operates as a subsidiary of Quanta Services Inc., a publicly traded, Houston-based specialty contractor that acquired Crux in 2012. Crux provides "difficult-logistics" geotechnical soil and rock core drilling—work that's often helicopter assisted for delivering workers and equipment—and also does power transmission line project work.

Neupert says the company employs about 110 people, with about 40 of them working here and the rest working in the field at job sites.