707 N. Calvert St.  |  Baltimore, MD

Stephanie Kunkel   |   Mechanical Option

This page was last updated on October 11, 2010 by Stephanie Kunkel and is hosted by the AE Department © 2010.


Building Statistics : Part 1

General Building Information

Building Name:


Occupancy Type:

Gross Building Area:

Total Number of Stories:

Total Renovation Cost:

Dates of Renovation:

Project Delivery Method:


SHA Headquarters—707 Systems Renovations

Baltimore, MD

Office Building

226,000 SF

8 (including 2 below grade)

Approx. $4,435,500

9/2010 — 5/2013



Primary Project Team


AE Firm:

Mechanical Contractor:



State Highway Administration

Johnson, Mirmiran & Thompson (JMT)

G.E. Tignall & Co., Inc.

The INTEC Companies

H.O. Whitcomb



Sustainability Features

The SHA Headquarters is located in downtown Baltimore and occupies two office buildings, 707 and 211, which were both originally build in 1959.  A connector between both buildings was build across Hunter Street in 2000.

The existing main building roofing is made of an inverted membrane roof with an IKO 2 ply “Armourplast Classic” membrane.  Comprised of a non-woven reinforced polyester mat, this product meets ASTM standards.

The Penthouse roofing is a membrane roof by U.S. Intec Inc.

LEED Certification is not going to be incorporated into the design and construction of the SHA Headquarters renovation.  However, mechanically sustainable features will be incorporated into the 707 redesign.  Systems will soon be placed so that in the summer months, reheat will be used to dehumidify the office building.

The 707 N. Calvert Street building has recently undergone significant architectural and engineering interior and shell renovations including building façade renovation, glazing replacement, roofing replacement, chiller/cooling tower replacement, branch electrical panel replacement, and air distribution ductwork (horizontal) replacement.

The current architecture of the State Highway Administration Headquarters falls under the category of International Style, popular between the 1930s-1980s.

Major Codes

The three primary design codes used for this renovation are the International Building Code (IBC) 2006, the American Concrete Institute (ACI) 318, and the American Society of Civil Engineering (ASCE) 7.  The remaining systems must adhere to the most current versions of the International Mechanical Code (IMC), the National Electrical Code (NEC), the International Plumbing Code (IPC), and the International Fire Code (IFC).


Historical Requirements

Building Façade

The building façade is constructed of precast concrete lintels; each 8” precast concrete lintel is reinforced with both top and bottom rebar.

The fenestration consists of aluminum framed  glass windows and entrance doors. 


Zoning requirements for the SHA Building Systems Renovation is type O-3: an Office Park Zone to be used exclusively for office development.

Image courtesy of Google Earth.

Image courtesy of Google Earth.

There are no historical requirements for this area.


Building Statistics : Part 2


The 707 $4.5 million systems renovation is led by AE firm JMT, and Mechanical Contractor G.E. Tignall & Co as a design-bid-build project.  This renovation will take place in multiple phases due to the occupancy limitations—only 20 occupants can be relocated at a time.


707’s electrical system includes 13.2 kV, S&C switchgear, (2) 1000kVA, 13.2kV - 480Y/277V silicone insulated transformers, and low voltage switchgear with 1600A, type DB-50 drawout breakers.  (2) 1350A, 3PH, 4W, epoxy insulated power bus ducts running from the Subbasement electrical room to the Penthouse make up the building power and lighting distribution.  The bus duct labeled “Power,” 1200A, 480Y/277V, 3-phase, 4-wire, feeds all of the mechanical equipment in the Penthouse.  The “Lighting” bus duct feeds each floor’s 480Y/277V panel boards.


Mainly 2x4 fluorescent light fixtures and compact fluorescent light fixtures make up the interior lighting for 707.  Each floor is controlled separately by the lighting control system located in first floor lobby.  This system functions with a low voltage, momentary push-button control station for central lighting control.  Toggle switches operate the lighting for the offices, while the central lighting control system is used for the open office spaces and corridors.  Each floor’s emergency light fixtures are attached to an unswitched lighting circuit so that night security lighting can be supplied.


707’s mechanical system is comprised of two low pressure central station air handling units (AHUs) serving the central core of the building and one high pressure central station AHU serving the central core of the building.  Cooling is provided by a chilled water plant, utilizing a centrifugal chiller and an updraft cooling tower; while heating is provided by two low pressure steam boilers and a steam-to-hot water heat exchanger.  Other parts of the system include (3) constant volume built-up AHUs, (534) induction units running along the 6 office levels, (18) VAV boxes that serve individual areas, (1) chilled water/hot water indoor unit, and (1) chilled water/steam indoor unit. 


The SHA Headquarters 707 building is a reinforced concrete structure.  The building is supported by concrete columns and the floor consists of a one-way joist and beam system.  The joists are 30” pan joists and are generally 14” deep with a 3 ¼” thick slab, and typically span between 18’ and 27’.  The beams are 17 ¼” thick to be consistent with the depth of the slab and pan joists, and range from 13” to 31” wide.  At many areas throughout the building, the beams are wider at the columns to account for the large negative bending moment at those points.  The roof structure also consists of a one way 30” pan joist system, although the slab is only 3” thick.

Fire Protection

“Simplex 4020” is the current fire protection analog-addressable system for 707.  This system has emergency battery backup and is comprised of central fire alarm control panels (FACPs), digital alarm transmitter, automatic detection mechanisms, manual reporting stations, and audible and visual strobe notification devices.   Interconnected to the main FACP are individual FACPs for both the CADD room (on the 2nd floor) and the Computer room (on the 6th floor).  Each room is outfitted with an under floor and ceiling mounted smoke detectors system as well as double interlocked, pre-action sprinkler systems that are valved separately from the sprinkler system for the rest of the building. 


The main service entrance telecommunication room is located on the Basement level.  Backbone cables are used to connect service entrance protectors to the main distribution frame (MDF) on the 1st floor - the main telephone hub for 707.  Located inside the MDF is the building PBX, horizontal backbone voice terminations, and a battery back-up system.  The Computer Room on the 6th floor of 707 is the building data hub.  The equipment is connected to floor data distribution racks on each floor by backbone fiber optic cables.  707’s voice distribution is achieved by backbone cables beginning at the MDF and terminating in wall mounted punch down blocks on each floor’s North and South IT rooms.