Unlike the earlier cost study, the building models
used for the LEED Cost Study are not based on
9.14/GSF (based on a November 2003
actual GSA projects. They are instead based on
building prototypes that GSA had previously
defined for project budgeting purposes (not
Sample schematic floor plans for the mid-rise
including LEED premiums). The budget models
Courthouse are illustrated in Figures 1 and 2
are defined in sufficient detail to establish a full
range of reference project costs, with estimates
reported in a Uniformat Level Three breakdown.
For the purposes of the study, both buildings are
The mid-rise Office Building reference model
assumed to be located in Washington DC.
includes two variants a "minimal faade
renovation" and a "full faade renovation", as
Some of the key features of the building models
noted under the Cladding/Fenestration System
are defined as follows.
Retrofit heading below.
New Mid-Rise Courthouse
306,600 GSF, including 40,700 GSF of
262,000 GSF, including 15,000 GSF of
Number of Stories: Nine
Number of Stories: Five
Structural System retrofit:
Pile foundations/grade beams/cast-in place
Cladding/Fenestration System retrofit:
Cast-in-place structural slab system for
Option A (minimal faade renovation):
Clean and caulk existing stone cladding.
Structural steel floor framing for upper floors
Replace existing windows and curtainwall
and roof. Steel deck w/concrete fill for floors.
with new aluminum framed systems
(fenestration is assumed to comprise 60% of
the wall area). Provide new insulated, tinted
floors. Precast concrete panel system for
Option B (full faade renovation):
Clean and caulk existing stone cladding on
Combination of aluminum curtainwall system
floors 1 and 2. Strip existing cladding and
and aluminum punched window system.
replace with new precast concrete panel
Insulated, tinted low-e glazings.
system for floors 3-9. Replace existing
windows and curtainwall with new aluminum
framed systems. Provide new insulated, tinted
Three water-cooled chillers sized for 50%,
low-e glazings. Reduce area of fenestration on
50%, and 20% of the cooling load
upper floors to 40% of wall area.
Roof retrofit: None assumed
Underfloor air distribution system with ceiling
Interior retrofit: Patching and repairing of
partitions at core spaces. New interior
partitions and finishes for all other spaces.
Total Site Area: Approximately 3.1 acres
New HVAC, electrical service/distribution,
lighting, plumbing, and fire protection
GSA LEED COST STUDY