Hybrid Workplace Test-Fit on a Deep 1970s Floor Plate
A 34,000 sq ft floor in a 1971 office tower is being replanned for a 210-person software company that now works hybrid: three days in, two remote, with no assigned seating. The core sits on the north edge, so the lease depth runs 132 ft from the south window line to the core wall, with additional glass on the east and west. Ceiling height is 8 ft 9 in, but structural beams and existing ductwork reduce the central third to 8 ft 0 in; the base building will not permit new penetrations through the post-tensioned slab. The brief demands 130 seats, 14 enclosed meeting rooms, 6 phone booths, a 40-seat town hall, a cafe, and a promise that no seat is more than 60 ft from daylight. The owner also wants a clear 60-in primary circulation loop so tours can move without crossing work areas. The test-fit is due in three weeks.
1. Is the 60-ft daylight promise achievable on this plate, and how should the plan be zoned?
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The promise cannot be met for every seat, and the geometry shows why. With a 132-ft depth, a 60-ft band from the south glass leaves 72 ft of depth in the north-central zone. On a plate of roughly 258 ft by 132 ft, that inner zone is over 18,000 sq ft, more than half the floor, and east/west glass only helps near the ends. The right response is to redefine the metric before the lease language hardens, for example all workstations within 60 ft of a window on at least one side, or 80% of seats within 45 ft, and then zone deliberately:
- Open workstations in 20-45 ft bands along the south, east and west glass.
- Enclosed meeting rooms, phone booths, storage, print and IT in the core-adjacent zone, where 8 ft 0 in clearance and no daylight are acceptable.
- Town hall and cafe at the core edge so they borrow light from open areas without blocking it.
- Keep the 60-in loop just inside the window band; it is circulation and social space, not a corridor through desks.
Test the result with a simple daylight metric and show the owner the area that falls outside. At 130 seats on roughly 29,500 net sq ft, density is only about 227 sq ft per seat, so depth and low structure, not area, are the binding constraints.
2. Test the programme against the available area and identify the biggest planning risk.
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Programme check: 14 meeting rooms at 250 sq ft each is 3,500 sq ft; the 40-seat town hall at 15 net sq ft per person is 600 sq ft; cafe 1,200 sq ft; six booths at 40 sq ft is 240 sq ft; support 1,500 sq ft. That is 7,040 sq ft, leaving about 22,460 sq ft for workstations and internal circulation. At 130 seats this is 173 sq ft per seat gross, generous against a 100-150 sq ft per seat benchmark, so the programme fits on paper. The risk is the ratio of enclosed rooms to seats (about 1:9) and the low central zone: 14 rooms at 250 sq ft cannot all sit in the daylight band, and rooms deeper than 25 ft with 8 ft 0 in ceilings will need careful lighting and absorptive treatment. Tell the owner that the meeting-room count, not the seat count, drives the plan, and propose 10 rooms plus additional booths or a divisible training room. Also verify base-building egress: 130 business occupants plus meeting rooms at 15 net, a 40-person town hall and the cafe could total 450-500 people, which may exceed the capacity of one 44-in stair.
3. What circulation widths and accessibility or egress issues govern the layout?
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Circulation: 44 in is the minimum accessible route; 36 in is permitted only at short pinch points. The 60-in tour loop is the right choice for a workplace because two people must pass without stepping into work zones. Keep the loop continuous and free of furniture, and provide 60-in turning space at the cafe and town hall entries. Limit dead ends to 50 ft in a business occupancy and avoid any path that passes through a workstation cluster. Doors should give 32 in clear minimum, with 36 in leaves for main rooms and 34 in preferred; avoid swings into the 60-in loop.
Egress: calculate occupant load by use, not headcount. Business at 150 gross and meeting rooms and cafe at 15 net will produce a much higher number than 130. Compare that load with the stair and exit capacity: a 44-in stair is 44 divided by 0.2, or 220 occupants at 0.2 in per person, and 293 at 0.15 in with voice alarm. A 400-500 person load will fail on one stair. The test-fit must include an egress check, and the base-building stair may need a second means of egress or a reduced programme before the plan is presented as feasible.