NRP Group LLC, a national multifamily developer based in suburban Cleveland, will build 800 apartments at The Buncher Co.'s $400 million Riverfront Landing development in the Strip District, the company announced. The company, which is finishing up the 319-unit Ascent 430 apartment complex in Warrendale, indicated it will pursue a 400-unit first phase project along the Three Rivers Heritage Trail that is expected to begin construction in the fall of 2015 on a schedule to begin delivering units in…