Exterior work is progressing on 200 West 88th Street, an 18-story residential tower on Manhattan’s Upper West Side. Designed by Robert A. M. Stern Architects and developed by Nortco Development, the 215-foot-tall structure will span 114,000 square feet and yield 36 condominium units in three- to five-bedroom layouts. The project will also contain ground-floor retail space and enclosed parking spaces on the second level. The property is alternately addressed as 568-574 Amsterdam Avenue and located at the corner of West 88th Street and Amsterdam Avenue.