S.C. Research Authority is moving its North Charleston headquarters to Summerville.

The state agency said today it has a contract to buy 10 acres with an option to purchase another 7 acres at Nexton, which is taking shape at U.S. Interstate 26 and Highway 17A.

The new building will house SCRA’s Charleston operations and the majority of its 185 employees.

SCRA sold its existing office campus on International Boulevard for $23.35 million to neighboring Boeing Co. in December.

The Nexton land deal will close within the next 150 days. Construction is expected to begin by end of the year, the authority said. The relocation to Summerville is scheduled for October 2014.

Nexton is mixed-use community being built by MeadWestvaco Corp.’s MWV Community Development and Land Management unit.

“While we carefully evaluated several properties throughout the region, Nexton was best-suited for our needs, location and space requirements,” said SCRA CEO Bill Mahoney.

The authority was created and chartered by the state of South Carolina 30 years ago. It helps manage federal research projects, and it collaborates with private businesses and universities to promote and commercialize high technology.