Lumbridge HQ was 34 x 18 m, 612 m², one storey, fifteen rooms. It is now
48 x 18 m over two storeys, twenty-six rooms and a hundred and
twenty-six seats — and the fourteen metres that were added are one room
rather than a second row of cellular offices, because area is not the
thing the building was short of.
**The commons** is the east wing: one volume, open all the way to the
roof at 7.0 m, with the block's old east curtain wall now looking into it
instead of onto a street. Two archways through that glass, four trees,
one refectory table on the axis of the corridor, and nothing along the
glazing.
**Level 2** sits at 4.2 m — floor to floor, not floor to ceiling, which
is the number people get wrong. A studio with nineteen metres of
unbroken north-lit floor, a library, two meeting rooms, a project room,
and a gallery that reaches 4.2 m out over the void so the commons can be
looked down into rather than merely walked through.
`WIDTH` became `BLOCK_E`: every room, wall and seat authored before the
wing existed is measured against the old east line, and folding the two
into one number would have stretched fifteen rooms sideways.
Three things worth knowing:
- Every existing seat id is unchanged. The README says to keep them
stable for the same reason street numbers survive repainting, and a
`Presence` binds to one.
- The balustrade is a wall and not a prop. `Plan` derives the walk
collider from the wall list, so a rail authored as furniture is a
balcony you can walk off, and the drop is a storey onto terrazzo.
- The wing's walls carry an explicit `height`, because "double height"
is a property of the walls and `ceiling: null` alone would leave a
lid you cannot see but the light rig can.
`src/test/office.test.ts` is new and is the README's own checklist, which
nothing had ever run: problems empty, seat ids unique building-wide, the
balustrade impassable from all three open edges, and a 0.1 m flood fill
proving every room on both levels is reachable on foot from the way in.
That last one caught a door authored 200 mm past the end of its wall —
silently dropped, room sealed, and invisible from every camera angle.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
karti
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