BRAND NEW Two new hotels are online for Indianapolis, part of the expansion of the Indiana Convention Center and RCA Dome. A 600-room Marriott is planned across the street from the center's main entrance. The $90 million hotel will include extensive meeting space and will connect to the center via skywalk. A 280-suite Adam's Mark hotel is going up two blocks from the convention center. Both hotels are expected to be completed by June 2000.