60x100 Steel Office Building

This page is ordered around the enclosed space that supports the open floor, because focus and call rooms are what make open desking usable and are the first thing cut.

The footprint holds 20 team zones — 4 across by 5 deep — and leaves 11 feet of depth for focus and call rooms at the floor's edge, so concentrated work has somewhere to go without booking a meeting room.

Efficiency is the useful number here: 300 square feet of enclosed floor per team zone, against a 224-square-foot module. That leaves working slack around each position. Plan the exit as carefully as the entrance; buildings are emptied under more time pressure than they are filled.

A 60 by 100 footprint is a clearly directional plan: 6,000 sq ft enclosed by 320 ft of wall, at a 1.7:1 length-to-width proportion. Along its 100 ft dimension it takes 6 runs of team zones at 16 ft, leaving 4 ft over — the 4 ft is where the argument about this size actually happens. Taken purely as arithmetic, 60 by 100 gives 3 team zones across the 60 ft dimension once 9 ft is reserved for movement, and 6 deep along the 100 ft dimension. Run as a an open working floor with enclosed space for the work that needs it, 9 ft across is below the 10 ft this use needs to be worth planning, so there are no focus rooms, so calls happen at desks and the open floor's noise becomes its defining feature Occupant load, egress and accessibility are determined for the specific project by the design professional and the authority having jurisdiction.

At 60x100 the operating question is a specific one: where does someone go to concentrate, and where do they go to take a call? That is a different question from the one a steel office building of another shape has to answer, and it is why this footprint is planned as an open working floor with enclosed space for the work that needs it rather than as generic covered area.

The work pattern this floor could equally be planned around is office space attached to a working or storage area in one building: there is no transition zone, so the working side's dirt, noise and traffic arrive in the office through a single door. Open desking in the centre with enclosed rooms on the perimeter, keeping daylight shared rather than walled into offices.

The 11-foot leftover depth is 660 square feet across the full width — deep enough to plan deliberately, and at this footprint it goes to focus and call rooms at the floor's edge, so concentrated work has somewhere to go without booking a meeting room. Interior divisions are the last decision that should be fixed, because they are the first one that usually changes.

The 4 feet of spare width runs the whole 100-foot length — 400 square feet of wall strip. It earns its keep as shelving, staging or a walking route, not as another team zone. Utilities entering on the wrong elevation quietly rewrite the interior layout.

Spent as a square 77 by 77 instead, the same 6,000 sq ft would stand 4 team zones across rather than 3, and would trade this plan's length for parallel access. That is the width-against-depth decision this footprint has already made. Compared with a 60 by 80 of the same width, the extra depth here adds run rather than reach: it buys about 6 team zones in line, and every position past the second is retrieved by moving what stands in front of it. At this size the building becomes a shared resource, and shared resources need a written rule for who parks where and which door is kept clear. The floor is occupied all day at varying densities, so circulation and acoustic separation matter more than desk count. Storage disappears from office plans and reappears as clutter on the floor. That movement pattern, not the 6,000-square-foot total, is what decides whether the leftover 11 feet is useful here.

Nominal bay division computes to 4 bays at about 25 feet, wider than the 14-foot module — so a position can sit inside a bay without a frame line splitting it. Insulating later is possible; framing for insulation later is much harder.

Depth here creates a hierarchy: 5 rows means front positions get used and rear positions get filled. Deciding which is which up front is what keeps 60x100 workable. Long spans buy flexibility that is only worth paying for if the operation actually changes shape.

Density increases before area does, which makes the initial provision of enclosed rooms a decision about the floor's future rather than its present.

Configured as an open working floor with enclosed space for the work that needs it, 60x100 is judged on whether the 20 team zones it holds match the operation, and on whether the 4 feet of spare width leaves the route this mode depends on.

• Does the work need four lanes across, or two lanes flanking an interior work hall, or does it need a second lane that this 60-foot span cannot give?
• Is the 100-foot length being bought for depth, or for the repeated bays — eight to ten repeated bays, which makes the layout a scheduling problem as much as a spatial one?
• What finished ceiling height do you want, and what service zone sits above it?
• Where does the service core go, and does the desk plan work around it?

Span drives headroom at 60x100: 60 feet of width on a 3:12 pitch puts 25.5 feet over the middle and 18 feet at the walls, so where a tall item stands matters as much as how tall it is. Depth is bought cheaply and width expensively, which is why this proportion tends to be argued about before anything else.

Height on a 60 ft span is a separate decision from the 100 ft length, and it is the span that sets the frame's behavior. Raising the eave over 6,000 sq ft affects every bay along the 100 ft dimension, so the test is whether open plan office floor genuinely needs the extra clear height or only the floor area.

Ventilation across 6,000 square feet at this height: continuous occupancy at desk density makes air handling a core system rather than an accessory.

The 60-foot gable can carry 4 openings, one per team zone, with 4 feet of wall left for piers between and beside them — the arrangement that keeps each position independently reachable. Height is the dimension people regret; it cannot be added later without rebuilding the frame line.

The 60 ft ends and the 100 ft sides offer very different opening budgets: 60 ft of end wall has room for one wide opening or two modest ones, while 100 ft of side wall can carry several without the openings competing. On this plan the deciding factor is whether open plan office floor or focus and call rooms should be the first thing reached from the door.

• 30x80 moves the count from 20 to 8 team zones (2 across by 4 deep), which is the reason to choose between them.
• 40x60 moves the count from 20 to 6 team zones (2 across by 3 deep), which is the reason to choose between them.
• 50x50 moves the count from 20 to 12 team zones (4 across by 3 deep), which is the reason to choose between them.

Because this footprint is planned as an open working floor with enclosed space for the work that needs it, the useful next reads are different from the ones a differently shaped steel office building suggests: open plan office floor, focus and call rooms, daylight distribution.

No price appears on this page. The quantities that scale an estimate at 60x100 are 6,000 square feet of slab, 111.1 cubic yards of nominal concrete, 5,760 square feet of wall cladding and 6,185 square feet of roof cladding. A wider bay is a structural decision and a longer bay is a layout decision; the two are often confused.

Enclosed rooms, acoustics and services distribution outweigh the desking. Cutting focus rooms saves the least and costs the most in use.

• interior partitions, ceilings and finishes across the whole floor
• the service core with restrooms and kitchen
• air handling for continuous occupancy
• small-power and data distribution density