Marketing has started for Tempo, a 103-unit residential condominium building at 300 East 23rd Street at Second Avenue.

The 19-story building has many balconies and its two main street facades are partially indented at angles.

The building has a 24-hour concierge, individual storage units and a bicycle room.

The Menolly Group of Ireland and Quantum Partners of New York are the developers. Kutnicki Bernstein is the developer. D'Apostrophe Design Inc., which is headed by Francis D'Haene, is handing interior design.

The apartments have 10-foot-high ceilings, floor-to-ceiling windows, black oak 5-inch wide wood floors, lacquer kitchen cabinetry by Gruppo Italia, SMC stone countertops, Bosch dishwashers and stainless steel gas cook-tops and ovens and Sub-Zero refrigerators.

Master baths have terrazzo walls and floors, with glacier glass tile accent walls and high-gloss vanities with Cosmic sinks.

Apartments range in size from 685-square-foot one-bedroom units to 1,491-square-foot three-bedroom apartments and in price from about $850,000 to $2,165,000.

All units come with Unitone, an intra-building security and communications system with a color monitor and emergency alarms, and Vertilinc, an electronic portal that gives residents access to a very wide array of services including ceiling and wall speakers, city guides, and wireless control of all electronics.

The building has a 25-foot-high lobby, a 1,900-square-foot Cine Tempo outdoor garden with a screening area, a private gym outfitted by Gym Source, an indoor/outdoor spa with sauna with men's and women's dressing rooms with showers.

It also has Up Tempo, a 2,600-square-foot entertainment sky lounge with panoramic vistas and an outdoor kitchen as well as a putting green and grass beds.