Homebuilder Richmond American Homes of Maryland Inc., with a regional office in Irvine, has purchased five acres of residential land in San Marcos for $15.6 million, according to CoStar Group and public data.

The seller of the land, comprising 39 lots at San Elijo Road and Double Peak Drive, was San Elijo Hills Development Co. LLC of Carlsbad.

Richmond American is among several developers that have built homes in the San Elijo Hills master-planned community in San Marcos.