HOUSTON — Dallas-based investment firm Nicholas Residential LLC has acquired a portfolio of six multifamily properties totaling 2,115 units in the Houston area. The properties include Chelsea Park and Riviera Pines in Houston, South Grand at Pecan Grove and Country Club Place in the northern suburb of Richmond, The Veridian in Webster and Skyhawk in Friendswood. Nicholas Residential will implement value-add programs to the communities’ amenity spaces, delivering new fitness centers, as well as upgraded resident clubhouses with coffee bars, pools with outdoor kitchens, dog parks, business centers and game rooms. The seller was Hudson Advisors. Cushman & Wakefield arranged an undisclosed amount of equity on behalf of Nicholas Residential for the acquisition.