Tile system — small, medium, large, and special

A Tile is a rectangular composable unit of the floor plate. Each Tile is exactly one HVAC climate zone. Tiles compose to fill the Net Leasable Area without remainder. The system is defined alongside the catalogue of Key Plans and the per-use-type zone depths that determine each Tile's interior geometry.

There are three regular tile families (Small, Medium, Large) and one residual family (Special Tiles). Sample assemblies appear in floor-plate tile combinations.

[edit]The three regular families

[edit]Small Tiles — 2,700 SF (250.84 m²)

Code	Name	Composition	Climate zones	Role
Tile A	Corporate Office	Single 2,700 SF unit	1	Mid-plate Corporate anchor
Tile B-1	[[topic-bim-private-office-key-plans	Private Office]]	5 PO (300 + 500 + 450 + 300 + 300) + Professional Small 800 ≈ 2,700 SF	6
Tile C-1	[[topic-bim-professional-office-key-plans	Professional Office]] (Med + Med + Small)	PO-M 2,000 + PO-M 450 + PO-S 300 = 2,750	3
Tile C-2	Professional Office (Large + Small)	PO-L 2,400 + PO-S 300 = 2,700	2	Larger-anchor professional
Tile C-3	(Alternatives)	Variant composition	2	See Alternatives PDF
Tile C-4	(Alternatives)	Variant composition	1	Civic / Academic anchor
Tile E-1	Mixed End Cap (Left)	Mixed PO + Professional Small + corridor	3	Left short side
Tile E-2	Mixed End Cap (Right)	Mirror of E-1	3	Right short side

Note. The V12 Methodology (p. 2) also documents a Small "Tile B" with composition 300 + 500 + 300 + 450 + 450 + 300 = 2,300 SF of PO + 400 SF residual. The Alternatives PDF expands Tile B into Tile B-1 with a Professional Small unit added. Tile B-1 is the live token; Tile B is the methodology shorthand for the same role.

[edit]Medium Tiles — 3,500 SF (325.16 m²)

This family is documented in the V12 Methodology but is currently absent from tile-system.dtcg.json — flagged for backfill.

Code	Name	Composition	Climate zones
Tile D	Corporate Office Medium	Single 3,500 SF Corporate unit	1
Tile E	Private Office Medium	8 PO (≈ 2,900) + corridor	8
Tile F (Medium)	Professional Office Medium	PO Small 800 + PO Small 800 + PO Medium 1,100 + PO Small 800 = 3,500	4
Tile E-1 (Medium)	Left End Cap (Private)	Mixed PO with end-cap corridor; ≈3,500–5,500 SF	8
Tile E-2 (Medium)	Right End Cap (Professional)	Mirror of Medium E-1 with Professional Office Key Plans	4–6

Naming collision. "Tile F" appears at both 3,500 SF (Medium Professional) and 4,900 SF (Large Corporate) in the V12 Methodology. The disambiguator is the family label. Tooling should normalise to tile-f-medium and tile-f-large to avoid ambiguity in the token store.

[edit]Large Tiles — 4,900 SF (455.22 m²)

Code	Name	Composition	Climate zones
Tile F	Large Corporate Office	Single 4,900 SF Corporate unit	1
Tile G	Large Private Office Mix	10 PO (300–500 SF each) + corridor	10
Tile H	Large Professional Office	5 PO units (800 + 800 + 1,100 + 800 + 1,400 = 4,900)	5

Large tiles approach the 1/4 floor tile (5,000 SF) in scale. They are useful for Corporate anchors, high-density Private-Office floors, and Professional Centres that need contiguous Professional Office sub-types.

[edit]6,000 SF Paired End Caps

A second End Cap series exists for buildings where the short side spans two paired Small tiles plus an Emergency Stairwell:

Code	Name	Use
Tile A-1	Corporate Office End Cap	Pair of Corporate Office units + Emergency Stairwell + Internal Corridor
Tile B-2	Private Office End Cap	Pair of Private Office groups + Emergency Stairwell
Tile C-3	Professional Office Medium End Cap	Two PO-Medium units + Emergency Stairwell
Tile C-4	Professional Office Large End Cap	PO-Large 2,400 + PO mix + Emergency Stairwell

Source: Alternatives PDF p. 2 (May 2025 and January 2026 variants).

[edit]Special Tiles

Special Tiles fill the residual area around the Building Core and the Elevator Lobby. Their sizes are variable and snap to the nearest Professional Office Key Plan width.

Code	Approximate sizes	Role
SP-A	400 / 1,350 / 2,000 / 2,100 SF	Core-adjacent filler (left and right of Core)
SP-B	300 / 800 / 900 SF	Secondary core-adjacent filler
SP-C	4,700 SF	Elevator Lobby front; constraint: no direct door-to-elevator alignment

Source: V12 Methodology pp. 3–5.

The Tile algebra (from V1 Combinations PDF) treats Special Tiles as a distinct composition class:

T_Basic     = n × P_Private_Small + p × P_Private_Medium + q × P_Private_Large
T_Compound  = T_Basic + r × P_(Academic | Laboratory | Medical | Business | Civic)
T_Special   = n × PO_Small + p × PO_Medium + q × PO_Large
              + r × P_(Academic | Laboratory | Medical | Business | Civic)
Floor Plate = T_Basic + T_Compound + T_Special + Building Core

[edit]Key Plan dimensions

From Tear Sheet "Key Plans and Tiles" (January 2026 V12):

Class	Small	Medium	Large
Private Office	300 SF (PO-1)	450 SF (PO-2)	500 SF (PO-3)
Professional Office — Medical	1,100 SF (M-1)	1,400 SF (M-2)	800 SF (M-3)
Professional Office — Business	1,100 SF (B-1)	1,400 SF (B-2)	800 SF (B-3)
Professional Office — Laboratory	1,100 SF (L-1)	1,400 SF (L-2)	800 SF (L-3)
Professional Office — Academic	1,100 SF (A-1)	1,400 SF (A-2)	800 SF (A-3)
Professional Office — Civic	1,100 SF (C-1)	1,400 SF (C-2)	800 SF (C-3)

Availability distribution (Tear Sheet January 2026):

Private Office: Small 80% / Medium 10% / Large 10%
Professional Office sub-types: Small 40% / Medium 30% / Large 20% (10% other / mixed)

[edit]Open research

Q1. The Tear Sheet "% of availability" for Medical/Business/Laboratory/Academic/Civic sums to 90%, not 100%. Confirm the missing 10% category.
Q2. Medical / Business sub-types have 1,100/1,100/1,400/800/800 mix totalling 5,200 SF, not 5,000. Reconcile with the 1/4 floor tile reference of exactly 5,000 SF.
Q3. Tile B-1 in the token file records "5 private offices + 900 SF corridor" but the Alternatives PDF shows 5 PO + a Professional Office Small (800 SF). Pick the canonical version.
Q4. Are the 6,000 SF End Caps (A-1, B-2, C-3, C-4) used only when the floor-plate length crosses a specific threshold? No source document states the trigger condition.