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.
The three regular families
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 | Private Office | 5 PO (300 + 500 + 450 + 300 + 300) + Professional Small 800 ≈ 2,700 SF | 6 | Private-office heavy interior |
| Tile C-1 | Professional Office (Med + Med + Small) | PO-M 2,000 + PO-M 450 + PO-S 300 = 2,750 | 3 | Professional anchor (Medical, Business) |
| 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.
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.
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.
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).
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
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)
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.