Construction of the North Addition of the South Nassau Communities Hospital began in December 2003 and was completed in May 2005. The construction manager on the project was Bovis Lend Lease. The project delivery method was guaranteed maximum price, and the actual construction cost of the project was $64,100,000.

Power is distributed at 5 kV to the existing hospital by the Village of Rockville Centre. The North Addition is served by a 5kV switch via an underground duct bank that is connected to new 5kV switchgear located on the corner of Oceanside Road and Oswald Court. The new switchgear is rated at 2,000 kVA, 5 kV, 3Ph, 5W primary and 480Y/277V, 3Ph, 4W secondary. Designed to provide the reliability and flexibility required in hospitals, the secondary power distribution consists of 480V, 3PH, 4W which provides service to lighting and equipment loads and is transformed down to 208Y/120V, 3Ph, 4W when necessary to provide power to receptacles and other equipment. A new 900 kW pad-mounted 480Y/277V diesel powered emergency generator was added to distribute emergency power for the new addition. As required by code, the secondary distribution system is separated into the following branches:

In general, the lighting design was guided by the desire to provide high quality light that enhances architectural features, improves occupant safety, and conserves energy. Recessed and pendant mounted linear fluorescent fixtures are used throughout the space in conjunction with compact fluorescent and metal halide downlights. Halogen downlights are also used primarily as accent lighting in select spaces. Special high color rendering lamps are used in special areas such as critical care. In spaces such as offices and storage areas, occupancy sensors provide energy efficient controls. Daylighting is utilized in the lobby, conservatory, offices, and patient rooms. Spaces were designed to meet IESNA recommended illuminance levels and code requirements.

The primary structure of the North Addition is supported by spread footings with grade beams. A 5” slab on grade reinforced with steel fibers sits on top of 6” of crushed stone and makes up the ground floor. Steel framing with a W18x40 typical beam size supports a floor system composed of a composite slab using lightweight concrete on top of a 20-gage 2” galvanized metal deck. A 1½“ deep wide rib steel roof deck spans between steel beams and supports roof and snow loads. Lateral forces are supported by braced and moment framing.