{
  "date": "2026-10-09",
  "revision": "F6 Indiana entrances / EV-D4 + L1 courtyard",
  "basis": "Review of Site version 28, source 4d14f1b18770db570901e9345c85e1b2b61035a6",
  "scope": "F6: reconciled 4500 upper doors to the upper-floor entry schedule, screened ground windows against ground-home allocations, refined legible door leaves/glazing/hardware and added close-up entrance views at all three sites. Existing shared stairs and landscape retained. Additional independent stairs, legal subdivision and full door/access review are not part of this facade pass.",
  "siteInputs": "Existing Chicago RFP parcel/GIS references retained. This pass did not obtain or validate a boundary/topographic survey.",
  "geometry": "Same saved building plates, apartment allocations, cores, galleries and stair reservations. 4200 limestone ground floor and corner quoins; 4500 upper bay projections and parapets. Saved rentable area and costs do not include the bay projections or architectural details.",
  "rendering": "Three.js physically lit, depth-tested meshes; measured procedural brick texture, stone grain, soft shadows and interactive orbit/zoom. No generated image substitutes for the model.",
  "references": [
    {
      "label": "Illinois Tech: Mecca Flats historical context",
      "url": "https://www.iit.edu/news/mecca-floating-monument-program-comes-illinois-tech-highlight-historic-mecca-flats"
    }
  ],
  "sites": [
    {
      "site": "4200",
      "address": "4200 S. Indiana",
      "revision": "F6",
      "homes": 35,
      "enclosedSf": 34600,
      "apartmentGrossSf": 31898,
      "totalDevelopmentCost": 13624455,
      "openingCount": 122,
      "doorOpeningCount": 54,
      "streetEntrances": [
        {
          "id": "AB-street",
          "segment": [
            [
              50,
              100
            ],
            [
              55,
              100
            ]
          ],
          "floor": 0,
          "kind": "street",
          "owner": "common",
          "group": "AB"
        },
        {
          "id": "CD-street",
          "segment": [
            [
              146.0904545570495,
              94.76740981921955
            ],
            [
              149.76740981921955,
              91.0904545570495
            ]
          ],
          "floor": 0,
          "kind": "street",
          "owner": "common",
          "group": "CD"
        }
      ],
      "faces": 31348,
      "triangles": 59731,
      "checks": [
        "Finite, triangulatable geometry",
        "Model inputs unmodified",
        "Current home count retained",
        "Window bays bounded within saved upper-home allocations",
        "No openings on party/shared/core walls",
        "No intersecting opening envelopes",
        "Door widths reconcile to saved entrance segments",
        "Home doors open into their own apartment allocations",
        "Door and window openings do not overlap"
      ],
      "limits": [
        "Ground windows follow ground-home allocations; upper windows follow upper-home allocations. Room partitions and detailed window placement remain unresolved.",
        "Adjacent stair strips are modeled as shared dogleg stairs inside the saved reservations: 4-ft flights and landings, nine risers per half flight. Enclosure, doors, structure and shared-egress operation remain unverified.",
        "Street doors follow saved common lobbies; courtyard home doors follow saved entry segments. 4500 upper doors follow the saved upper-floor entry schedule rather than repeating the ground floor. Core door positions are concept reservations. Door swings, fire separation and accessible thresholds still need review.",
        "The 4500 corner footprint remains an explicit exception to the later equal-leg frontage target.",
        "Mecca street bays project 2.5 ft above ground and carry the parapet around their three faces. Bay floor area, structure and encroachment approval are not included in the saved area or cost model.",
        "Limestone ground-floor cladding and alternating corner quoins at 4200 are visual design assumptions, not structural masonry or priced quantities.",
        "Masonry, glazing, terracotta, metalwork and landscape details are unpriced."
      ]
    },
    {
      "site": "4500",
      "address": "4500–4514 S. Indiana",
      "revision": "F6",
      "homes": 46,
      "enclosedSf": 46156.000000000015,
      "apartmentGrossSf": 42127.333333333336,
      "totalDevelopmentCost": 18122409.753333338,
      "openingCount": 174,
      "doorOpeningCount": 61,
      "streetEntrances": [
        {
          "id": "A-street",
          "segment": [
            [
              29.8,
              168
            ],
            [
              34.2,
              168
            ]
          ],
          "floor": 0,
          "kind": "street",
          "owner": "common",
          "group": "A"
        },
        {
          "id": "B-street",
          "segment": [
            [
              139.42378789038284,
              162.76740981921955
            ],
            [
              143.1007431525529,
              159.0904545570495
            ]
          ],
          "floor": 0,
          "kind": "street",
          "owner": "common",
          "group": "B"
        },
        {
          "id": "C-street",
          "segment": [
            [
              139.42378789038284,
              5.232590180780451
            ],
            [
              143.1007431525529,
              8.909545442950499
            ]
          ],
          "floor": 0,
          "kind": "street",
          "owner": "common",
          "group": "C"
        }
      ],
      "faces": 27403,
      "triangles": 50268,
      "checks": [
        "Finite, triangulatable geometry",
        "Model inputs unmodified",
        "Current home count retained",
        "Window bays bounded within saved upper-home allocations",
        "No openings on party/shared/core walls",
        "No intersecting opening envelopes",
        "Door widths reconcile to saved entrance segments",
        "Home doors open into their own apartment allocations",
        "Door and window openings do not overlap"
      ],
      "limits": [
        "Ground windows follow ground-home allocations; upper windows follow upper-home allocations. Room partitions and detailed window placement remain unresolved.",
        "Adjacent stair strips are modeled as shared dogleg stairs inside the saved reservations: 4-ft flights and landings, nine risers per half flight. Enclosure, doors, structure and shared-egress operation remain unverified.",
        "Street doors follow saved common lobbies; courtyard home doors follow saved entry segments. 4500 upper doors follow the saved upper-floor entry schedule rather than repeating the ground floor. Core door positions are concept reservations. Door swings, fire separation and accessible thresholds still need review.",
        "The 4500 corner footprint remains an explicit exception to the later equal-leg frontage target.",
        "Mecca street bays project 2.5 ft above ground and carry the parapet around their three faces. Bay floor area, structure and encroachment approval are not included in the saved area or cost model.",
        "Limestone ground-floor cladding and alternating corner quoins at 4200 are visual design assumptions, not structural masonry or priced quantities.",
        "Masonry, glazing, terracotta, metalwork and landscape details are unpriced."
      ]
    },
    {
      "site": "4823",
      "address": "4823 S. Evans",
      "revision": "EV-D4",
      "homes": 22,
      "enclosedSf": 21960,
      "apartmentGrossSf": 19090,
      "totalDevelopmentCost": 8839752.07,
      "openingCount": 100,
      "doorOpeningCount": null,
      "streetEntrances": [],
      "faces": 13784,
      "triangles": 23728,
      "checks": [
        "Finite, triangulatable geometry",
        "Model inputs unmodified",
        "Current home count retained",
        "EV-D2 opening schedule and access reservations retained"
      ],
      "limits": [
        "Bay projection bounds match v20 (2.5 ft west); ground/slab footprint, homes, stories and saved egress reservations unchanged. Cantilevers are not added to modeled rental or FAR area.",
        "Ground portal is a true wall void. Upper portal windows belong separately to A-1/B-1 with an opaque center pier; courtyard kitchen sills are raised to 4 ft above floor.",
        "Upper east-end windows belong to A-3/B-3; ground east ends remain the saved service band. Ground elbow windows fit housing polygons, but detailed ground room layouts are not encoded.",
        "Room partitions, high-sill emergency openings, bay structure and legal projection treatment remain unresolved.",
        "Dogleg stairs retain each saved 18 × 10 ft exterior reservation and connect its west floor landing to the existing gallery. No new floor or rental area is assumed.",
        "Each flight has a nominal 4 ft tread width and each turning/floor landing has 4 ft depth. Rail encroachments, finishes, door swings and finished clear egress widths remain to be coordinated.",
        "The 14 ft first story uses 24 equal 7 in risers and 10.909 in tread goings; each 12 ft story uses 22 equal approximately 6.55 in risers and 12 in tread goings. Treads use the actual 10 ft available run; dimensions are an illustrative fit, not a code approval.",
        "An assumed 11 in first-story tread target would need a 10 ft 1 in run, 1 in more than the retained 10 ft run. Meeting that target requires explicit plan, landing or height coordination; the saved reservation has not been silently resized.",
        "Closed tread/riser faces, thin landing slabs, posts, flight rails and landing guards are modeled. Rail joins, returns and extensions are schematic; structural supports, guard infill, drainage and independent required egress still require design review.",
        "Stair refitting for the retained taller floor heights remains unpriced; saved homes, stories, footprints and financial inputs are unchanged.",
        "Facade, new openings, stair geometry, structure and retained 14/12-ft heights remain unpriced; rents and construction inputs remain unchanged; RFP land allowance corrected on 9 October 2026."
      ]
    }
  ]
}