Professional Office — key plans baseline

Professional Office is the superordinate category for five sub-types: Business, Medical, Laboratory, Academic, and Civic. It carries an "Initial Design" baseline that pre-dates the sub-type specialisation and is preserved as design lineage. Suite geometry is computed using the Building Width Calculator and the per-use-type values catalogued in zone depths per use type; the Key Plans feed the Tile system and the floor plate methodology.

[edit]The Initial Design baseline

Field	Value
Small	130 m² / 1,400 SF
Medium	Not sampled
Large	Not sampled
Zone 1 — Habitat	6.0 m / 19'-8"
Zone 2 — Magazine	3.8 m / 12'-5"
Zone 3 — Corridor	2.0 m / 6'-6"

Computed building width = 2 × (6.0 + 3.8) + 2.0 = 21.6 m (70'-10").

[edit]Tenant categories

The Key Plans system recognises eleven tenant categories:

Private Office
Professional Office — Business
Professional Office — Medical
Professional Office — Laboratory
Professional Office — Academic
Professional Office — Civic
Corporate Office — 1/8 Floor
Corporate Office — 1/4 Floor
Corporate Office — 1/2 Floor
Corporate Office — 3/4 Floor
Corporate Office — Full Floor

A generic Professional Office tenant who does not fall into any of the five specialisations uses the Initial Design baseline at 130 m² / 1,400 SF. In practice this is rare: most professional-services firms self-identify as Business, clinical practices as Medical, and research operations as Laboratory.

[edit]Why Small + Small combinations matter

Combining two Professional Office Smalls fills the gap between Professional Office Large and Corporate Office 1/8 Floor. The combinations table across sub-types:

Combination	Lab	Academic	Business	Medical	Civic
Small + Small	390 m² / 4,198 SF	210 / 2,262	622 / 6,700	446 / 2,402	540 / 5,824
Small + Medium	511 / 5,500	345 / 3,714	711 / 7,652	554 / 5,969	847 / 9,127
Small + Large	596 / 6,412	483 / 5,201	980 / 10,874	709 / 7,633	1,092 / 11,762
Medium + Large	717 / 7,714	618 / 6,653	1,069 / 11,826	817 / 8,799	1,399 / 15,065

Combinations are how a Professional Centre fills a floor plate without gaps. Two Small Lab suites (390 m²) plus one Medium Medical suite (331 m²) plus one Large Civic suite (822 m²) = 1,543 m² — which fits inside a typical 19,000–23,000 SF Professional Centre floor alongside the building core, amenities, and elevator lobby.

[edit]Initial Design vs sub-type zone widths

The Initial Design Z2 = 3.8 m is narrower than four of the five sub-types:

Sub-type	Z2 Magazine	Delta vs Initial Design
Initial Design	3.8 m	(baseline)
Academic	3.0 m	−0.8 m
Medical	4.9 m	+1.1 m
Laboratory	4.8 m	+1.0 m
Business	7.3 m	+3.5 m
Civic	7.2 m	+3.4 m

The Initial Design cannot satisfy any of the five specialisations without dimensional expansion. It serves as the "Professional Office without specialisation" footprint — as soon as a tenant declares a specialisation, the sub-type's Building Width Calculator applies.

[edit]The 21 m vs 21.6 m discrepancy

The methodology presents the Professional Office total floor-plate width as 21 m (centreline) and 21.6 m when demising and structural walls are included. The arithmetic 2 × (6.0 + 3.8) + 2.0 = 21.6 m confirms that the "21 m" figure is the centreline-to-centreline distance and 21.6 m includes a 0.6 m demising-structural overhead. This overhead should be encoded as a distinct DTCG token to make the arithmetic self-documenting.

[edit]Why no Professional Office Medium / Large samples exist

No source document carries a Professional Office Medium or Large sample at the Initial Design baseline. The sub-type Medium and Large roles are filled by the five specialisations' own Medium and Large samples. A tenant who needs a larger generic Professional Office in practice leases two Smalls (Small + Small ≈ 260 m² / 2,800 SF).