A building has a floor space of 16.7 m (55 ft) by 45 m (150 ft) with a common core measuring 9.17 m (30 ft) by 13.7 m (45 ft). How many individual can be provided in the usable floor space?

50 work areas results from applying an incorrect per-work-area allocation larger than 100 sq ft or using only a subset of the usable floor space in the calculation.

58 work areas does not correspond to any correct application of the standard 100 sq ft per work area allocation to the 6,900 sq ft of usable space.

The total floor space is 55 ft x 150 ft = 8,250 sq ft, and the unusable common core is 30 ft x 45 ft = 1,350 sq ft, leaving 6,900 sq ft of usable floor space. Dividing 6,900 sq ft by the standard 100 sq ft per work area allocation yields exactly 69 individual work areas. This calculation follows ANSI/TIA-568 and BICSI methodology for determining the required number of telecommunications outlets based on usable floor area.

77 work areas would result from incorrectly including part of the common core area in the calculation or applying a per-work-area allocation smaller than 100 sq ft.

85 work areas results from calculating outlets against the full 8,250 sq ft total floor area without subtracting the 1,350 sq ft common core.