Near Chelsea’s raggle-taggle intersection of Seventh Avenue and 23rd Street, a new residential building has begun its 17-floor rise skyward. The 53,135-square-foot tower designed by C3D Architecture will boast 50 rental apartments with first and cellar levels dedicated to commercial and retail uses. Floors two through 11 will be configured with four apartments per floor and floors 12-16 just two apartments apiece. According to C3D, the exterior will be clad in a subdued mix of limestone and metal panels with full-height glass windows wedged in between. The second floor will be provided a large rear terrace and all levels above will have west-facing balconies. The twelfth floor is setback and the uppermost four levels will be outfitted with street-facing balconies.