Nathanael Paist

Building Statistics

Part 1

 

General Building Data:

 

Building Name:  Two Liberty Center

 

Location and site:  Arlington, VA

 

Building Occupant Name:  Ballston Investor Group, LLC

 

Occupancy or function types:

1. Class A Offices
2. Retail
3. Parking Garage

Size:  180,000 square feet above grade

 

Number of Stories:

1. 9 Above Grade
2. 4 Below Grade

Primary project team:

            Owner – The Shooshan Company (www.shooshancompany.com)

            GC/CM – Clark Construction Group, LLC (www.clarkconstruction.com)

            Architect – SmithGroup (www.smithgroup.com)                                                          

Structural Engineer – SK&A Structural Engineers, PLLC (www.skaengineers.com)

MEP Engineer – TOLK, Inc. (www.tolk.net)

           

Dates of Construction: June 2005 – December 2007

 

Building Cost: $34 Million

 

Project Delivery Method:  Design/Negotiate-Bid-Build

Architecture:

 

Architectural Description:

           

The main entrance to the building is at the base of an architectural glass tower standing at the southwest corner of the building.  Inside the entrance is a luxurious main lobby for the building accented by natural stone and terrazzo floors.  Through the lobby is access to the high-end retail spaces on the ground level, and elevators to the Class-A office space on the floors above.  Each floor above ground level has 20,500 SF of rentable office space.  Office floors have a central core surrounded by 20’x 40’ bays with 9’ finished ceilings.  The glass tower on the southwest corner offers an ideal space on each office floor for a sunlit conference room or a one of a kind executive office.

 

Major National Model Codes:

           

Zoning:

Zoning Ordinance

Arlington County, Virginia

            C-O-A: Commercial Office and Apartment Districts

            Zoning Map

 

Building Envelope:

           

The exterior façade of the building is composed of pre-cast architectural panels and glass curtain wall systems with metal cladding.  Glass wall systems are located at the ground level near main entrances and also compose most of the architectural tower at the southwest corner.  Pre-cast panels are a smooth finish concrete with textured rock-face accents and punch windows.  The penthouse level is surrounded by a textured finish EIFS.  Roofing system for the building is a hot fluid-applied rubberized asphalt membrane topped with washed river gravel and pre-cast concrete pavers.

Part 2

 

Primary Engineering Systems:

 

Construction:

            Two Liberty Center is a shell and core office building being constructed as part of a three building expansion of the Liberty Center complex.  The project is being delivered under a modified design-bid-build method.  Modification to the traditional method includes the involvement of the general contractor as a negotiator during the design phase.  For their services on the project, the general contractor is held under a cost plus fee contract with a guaranteed maximum price.  Trade contracts were awarded after a competitive bid, and were selected on the basis of lowest cost with the most reliable scope of work.

 

Structural:

            The super structure of the building is composed of reinforced cast-in-place concrete slabs and frame.  All elevated slabs are 8” thick and slabs for floors 2 through 9 are post-tensioned to accommodate a typical bay size of 20’x 40’.  The foundation consists of cast-in-place concrete spread footings with a 5” thick cast-in-place slab on grade.

 

Mechanical:

            Conditioned air for Two Liberty Center is supplied by 12 Factory-Built Air Handling Units with chilled water cooling coils and electric heating coils.  Cooling capacity is provided through a central chilled water plant consisting of 2 centrifugal water chilling units and 2 roof-top cooling towers.  Air volume is digitally controlled for multiple zones provided by Variable-Air-Volume boxes.

 

Electrical:

            Service for the building is provided through a 277/480V, 3-phase, 4-wire, 8000A Utility Service Junction Box.  Distribution through the building is handled by two 277/480V, 3-phase, 4-wire, 3000A switchboards, with an additional 277/480V, 3-phase, 4-wire, wye-connected, 1200A Bus Gutter for Retail service connection.  Total connected loads for the two switchboards, MS1 and MS2, are 1852kVA and 2784kVA respectively, in addition to a total connected load for the retail bus gutter of 1203kVA.  Emergency power will be provided through a diesel engine driven electric generator set rated for 277/480V, 3-phase, 4-wire, for a minimum 550kW/687.5kVA load.