151 Commercial Buildings

In 1997, there were 4.6 million commercial buildings in the U.S., occupying 58.8 billion square feet of floor space and consuming 126,500 Btu of delivered energy per square foot of space annually. Sixty percent of U.S. commercial buildings range from 5000 to 100,000 square feet. Eighty-two percent range from 1000 to 200,000 square feet. The size class with the largest membership is the 10,000 to 25,000 square foot range.

1.5.1.1 Buildings Disaggregated by Building Type and Floor Space

The use of building space is a key influence on energy consumption and a key determinant of DG plant size. Of the total square footage of commercial office space, 67% is used for mercantile and service purposes, offices, warehouses and storage, or educational facilities. The average square footage for all building types ranges from 1001 to 25,000 square feet. The largest building types, from 20,000 to 25,000 square feet, are lodging and health care facilities. Medium-sized building types from 10,000 to 20,000 square feet are vacant buildings, public order and safety, offices, mercantile and service, and public assembly. Small building types, less than 10,000 square feet, include warehouse and storage facilities, education facilities, and food service and sales. Table 1.4 summarizes the typical sizes of different types.

Size Distribution of U.S. Commercial Building Space — Commercial Building Size as of 1995 (Percent of Total Floor Space)

Square Foot Range

Percent

1001 to 5000

10.80

5001 to 10,000

12.80

10,001 to 25,000

18.90

25,001 to 50,000

13.10

50,001 to 100,000

13.60

100,001 to 200,000

11.50

200,001 to 500,000

9.40

Over 500,000

9.00

Total

Commercial Building Sector Size and Typical Floor Area — 1995 Average and Percent of Commercial Building by Principal Building Type

TABLE 1.4

Commercial Building Sector Size and Typical Floor Area — 1995 Average and Percent of Commercial Building by Principal Building Type

Building Type

Floor Space (%)

Average Floor Space/Building (ft2)

Mercantile and Service

22

11260

Office

18

12870

Warehouse/Storage

14

6670

Education

13

1770

Public Assembly

7

12110

Lodging

6

22900

Health Care

4

22220

Food Service

2

4750

Food Sales

1

4690

Public Order and Safety

2

14610

Vacant

9

18480

Other

2

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