315 East 46th Street
Manhattan, NY
Building Statistics
General Building Info
Building Name
Location
Occupancy
Size
Height
Levels
Project Delivery
Construction
315 East 46th Street
Midtown Manhattan, NY
Residential
117,000 sf
330 ft
25 above grade and 2 below grade
Design-Bid-Build
2008- Never Completed
Project Team
Architect
Construction Manager
MEP Engineer
Structural Engineer
Elevator Consultant
Exterior Wall Consultant
Sydness Architects
Pav-Lak
Edwards and Zuck
Leslie E. Robertson Associates
Jenkins and Huntington
Gordon H. Smith Corporation
Sydness Architects
Sydness Architects
Architecture
The front façade of the building is angled in to create a patio area in front of the entrance to the building. This angle also creates better views for the apartments. When ascending, the plan has setbacks which creates terrace areas for some apartments. The North and South façades are glass cladded and finished with a curtain wall crown at the top which gives the building a unique identity in the skyline. The building was designed based on the 1968 New York City Building Code and C1-9 Zoning which is for commercial districts that are primarily residential in character.
Building Enclosure
The façades on the North and South sides use a curtain wall system. Type A glass (laminated translucent glass) is used at and above the roof level. Type B glass (1” Insulated Glazing unit with coating for solar performance) is used throughout the rest of the building. The East and West facades are made up of CMU because they are covered by the adjacent buildings for most of the height. The wall sections can be seen below.
The roofing system consists of hot fluid applied membrane roofing, reinforcing sheet, separation sheet, rigid insulation, and either pavers or stone ballast. Flashing is required at corners, joints, penetrations, curbs and drains. A lightweight concrete topping slab is used to slope the roof towards drains. A detail of this system is below.
CMU Wall Section
Curtain Wall Section
Roof Section
Structural
The structural system for 315 East 46th street is made up of cast-in-place reinforced concrete elements. The main gravity system utilizes 8” flat plate slabs supported by both round and rectangular columns. The round columns range from 18” to 26” diameter at the base level and are 18” diameter at the upper levels. The rectangular columns are on average 16”x 32” at the base level and 12”x 32” at the upper levels. Lateral loads are taken through shear walls in both directions. The shear walls range from 10” to 18” thick. In the N-S directions moment frames are connected to the shear walls at the exterior face to create a combined system. The beams of the moment frame are 12”x 24” and are cast monolithically with the slab. The foundations at 315 East 46th street are all shallow and bear on bedrock. Below the core of the building a mat foundation is used due to the heavy concentration of columns and walls. The mat foundation is as thick as 10’ at some locations. The wall and column footers are approximately 3’ thick.
Mechanical
There are two main mechanical spaces in 315 East 46th street one at the roof level which houses a closed circuit cooling system as well as one at the lower basement level which houses the heating system. The closed circuit cooling system is made up of a 405 ton cooling tower hooked up to a heat transfer package. This provides cold water for apartments as well as services the water source heat pump which provides cool air to the apartments. The Heating system utilizes steam at 200 PSIG pressure and a heat exchanger to provide hot water to the apartments. This hot water also services the water source heat pump to provide warm air to the apartments.
Besides from the main mechanical system there are two rooftop air conditioning units that supply the 23rd floor penthouse and the condo corridors throughout the building.
Electrical
The electrical service room for 315 East 46th street is located on the Upper Cellar level. This is where the power comes into the building and is distributed by four service feeders to two switchboards, a fire alarm control panel, and a fire pump. One of the two switchboards serves all of the apartment panels which are a mix of two and three phase panels. The load on this switchboard is approximately 1200 kilowatts. The other switchboard serves all of the other electrical needs such as HVAC equipment through distribution panels. The load on this switchboard is approximately 1000 kilowatts.
Lighting
The most used light source is a 5” diameter 32 W TT fully recessed wide angle compact florescent downlight. These lights are used throughout the apartment’s bathroom, kitchen, and hallways. The main open areas of the apartments such as the living, dining and bed rooms do not have built in lighting.
Service areas such as mechanical spaces and stair towers use 4’ long 32W T8 fluorescent tube lights with some containing emergency ballast and battery packs. Also lighting in the stair towers and corridors contain occupancy sensors. All lighting runs on 120 volt power source.
CPEP finalized and ready for review
4/21/18
4/21/18
Final CPEP Review
12/8/17
12/8/17
11/14/17
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