Building Statistics
Building Name:
1919 Market Street
Location:
Philadelphia, Pennsylvania
Site:
1919-43 Market Street in the City of Philadelphia
Occupant Name:
Brandywine Realty Trust
Occupancy Type:
Mixed Use
Size:
457,000 square-feet
Number of Stories:
29 Floors above grade
Construction Duration:
October 2014 – Spring 2016
Estimated Cost:
$140 million
Project Delivery Method:
Design Bid Build
Project Team:
Architect:
Barton Partners Architects Planners
Structural Engineer:
O’Donnell and Naccarato
Civil Engineer:
Pennoni Associates, Inc
MEP Engineer:
Bala Consulting Engineers, Inc
Construction Manager:
Hunter Roberts Construction
Applicable Building Codes:
International Building Code 2009
International Mechanical Code 2009
National Electrical COde 2009
NFPPA
AMCA
Architecture:
1919 Market is a 29 story mixed use facility designed utilizing cast-in-place and precast concrete elements. These elements act as structural and architectural framing to enclose and decorate over 457,000 square feet of floor space. Over 24,000 square feet of this is devoted to retail and office space on the first two stories and the remaining 433,000 square feet is divided into 321 luxury apartments on the remaining floors. Included in the residence space is a lavish outdoor area on the 28th story equipped with a rooftop lap pool, cardio and strength training equipment, and multiple lounge spaces. The exterior face of the building will be decorated with colored panes of glass to accent the building and separate it from those surrounding it.
Building Enclosure:
1919 Market is comprised of two main components, a parking garage and a retail/residential tower. The typical tower enclosure in comprised of a concrete floor slab framing into a window wall system. This window wall system is made up of an aluminum panel connected to glass that is both thermally and acoustically insulating. Each unit will vary in the color of the glass panel that both allows the resident to have a filter between themselves and the public and to add extra aesthetic appeal from the street view. All of the window walls will attach to the concrete slab using backer rods and proper sealant to deter wind and moisture. The parking garage will also be decorated with similar glazing panels with openings for proper ventilation.
Zoning:
Zoning requirements are based on the Philadelphia Code of Pennsylvania.
Historical Requirements:
This building site has no historical requirements to restrict the design and building process.
Sustainability:
Project developers for 1919 Market hold the goal to achieve a minimum of LEED Silver upon the completion of the building. All commissioning for the project is to meet the requirements for USGBC LEED 2009 New Construction. To achieve this goal multiple features will be employed including the following:
Energy Star appliances within each apartment
Low flow restroom fixtures
Efficient lighting and mechanical systems
Greywater management
Recycled rubber impact insulation
Awaiting Permission to use renderings
Structural Systems:
The structural system for 1919 Market Street is primarily cast in place and precase concrete with the particular system varying from floor to floor. The lower levels (Ground -5th Floor) are comprised of a 9" voided slab system. Above this (Floor 6-27) is a 8" one way concrete slab. each floor is supported by an array of concrete columns and edge beams around the perimeter of the building. The assembly of the voided slab is an innovative one which is comprised of a thin precast slab which is installed on site, followed by an arrangement of polystyrene blocks and appropriate reinforcement which is all then topped with another layer of cast in place concrete. When fully engaged this system doesnt need additional formwork because the precast slab acts as structure and formwork and because the polystyrene blocks are incorporated the slab is able to be much lighted than a typical slab while attaining the necessary strength.
Mechanical Systems:
A variable refrigerant volume system (VRV) will be used throughout the building. This type of system is relatively new in the United States but gives each occupant more control and the ability to operant more efficiently the more traditional systems. For 1919 Market Street there will be one rooftop unit which has the capacity to supply 22,255 CFM and exhause 18,155 CFM. For the VRV system contains 3 outdoor rooftop units which condensing fans condition a total of 25,000CFM. The system also has additional indoor ceiling mounted units which conditions another 283 CFM per unit.
Lighting/Electrical Systems:
1919 Market Street uses entirely flourescent and LED lighting fixtures. In the residential spaces only LEDs are used and floursecents are utilized in the penthouse areas. The building is powered by 3 phase, 13.2 kilovolt power from PECO. The power is distributed to 1 of 2 substations where it is transformed down to 480/277 or 208Y/120 for mechanical syatems and lighting fixtures. The lighting system will include vacancy and occupancy sensors to conserve energy. Aesthetically each unit will have a colored glass panel that provides solar shading and an ambient coloration to the space. Lastly ther is a 500 kilowatt diesel powered generator for emergencies.
Construction:
1919 Market Street had been in the development stage for an extended period of time which is why a design bid build delivery method was used. It was more convenient for all parties involved to have the project designed and select a contractor at a later time to avoid scheduling conflicts while the project was obtaining funding for construction.
Fire Protection:
1919 Market Street will be contain a sprinkler system which will use multiple variations of sprinkler heads. There will be concealed pendent and sidewall head in the apartment for aestetics. Throughout the rest of the buiding sidewalla dn upright heads will be used. These locations will be below the elevator shaft, mechanical and electrical and telecommunications rooms along with storage and closet areas. The sprinklers will use a series of fire pumps connected into the public water lines to maintain pressure in the system at all locations throughout the building. Fire pumps will also vary depending on what areas they are connected to and these are double check valve, jockey pump, and typical fire pumps from Auroa. The sprinkler system will be powered both by electric and diesel engines.
Image courtsey of architectural drawings provided by Barton Partners and LCOR