{
  "revision": "4200-entrances-v3",
  "date": "2026-10-09",
  "site": {
    "id": "4200",
    "address": "4200 S. Indiana",
    "lot": 16000,
    "width": 160,
    "height": 100,
    "maxFar": 4.4,
    "zoning": "RM-6",
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        "count": 2,
        "axis": 0,
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        "id": "B",
        "name": "Middle 42nd Street bar",
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        "id": "C",
        "name": "Equal-leg chamfered corner building",
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      {
        "id": "D",
        "name": "Indiana house + short south wing",
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            120,
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        ],
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          ],
          [
            95,
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          ],
          [
            77,
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          ]
        ],
        "loggias": [
          [
            [
              115,
              25
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              120,
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            ],
            [
              120,
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            ],
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              115,
              50
            ]
          ],
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              95,
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              115,
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            ],
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              115,
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            ],
            [
              95,
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            ]
          ]
        ],
        "units": [
          {
            "id": "D1",
            "polygon": [
              [
                95,
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              ],
              [
                155,
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              ],
              [
                155,
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              ],
              [
                95,
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              ],
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                95,
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              ]
            ],
            "holes": [],
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          },
          {
            "id": "D2",
            "polygon": [
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              ],
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              ],
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                155,
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                120,
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              ],
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                120,
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              ],
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                138,
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              ],
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                138,
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              ],
              [
                120,
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              ],
              [
                120,
                25
              ]
            ],
            "holes": [],
            "bedrooms": 1
          }
        ],
        "count": 2,
        "axis": 1,
        "wing": null
      }
    ],
    "baseFar": 2.365,
    "baseApartments": 7455,
    "drive": "https://drive.google.com/drive/folders/13Z15mKLVgM1u44iZPdL-s_c1l3EUGyEy",
    "review": [
      "Four complete central main cores and dedicated street vestibules replace the two split shared main cores. The two exterior backup stairs and open galleries remain shared; this is four entrance clusters, not a legal subdivision or an elevator exemption.",
      "Street bars remain 40 ft deep. The south wing remains 30 ft wide but is shortened from 40 to 20 ft.",
      "Ground floor has seven connected allocations after street approaches and service reserves are deducted. Five ground homes are conservatively underwritten as 1BD, one as 2BD and one as 3BD; full rooms, coat vestibules, kitchens, baths, accessible routes and fixtures still need design development.",
      "RFP land and four affordable homes are retained. Rents and construction rates are unchanged; area and bedroom mix drive the revised pro forma."
    ],
    "plan": "/4200-access/site-plan.svg",
    "viewer": "/?site=4200&view=massing#current-design",
    "stage": "Four main entrances + shorter south wing",
    "gisNote": "County GIS is approximately 160.8 × 100.2 ft / 16,115 sf. RFP dimensions drive this study."
  },
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      "id": "A1",
      "building": "A",
      "geometry": [
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            [
              0,
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      ],
      "area": 828.75,
      "bedrooms": 2,
      "bathrooms": {
        "full": 2,
        "powder": 0
      },
      "entry": [
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        [
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      ],
      "vestibule": [
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          15,
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        [
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      ],
      "coat": [
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          15,
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      ],
      "kitchenWall": [
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          0,
          65
        ],
        [
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        ]
      ],
      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified."
    },
    {
      "id": "A2",
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              83
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      "area": 828.75,
      "bedrooms": 2,
      "bathrooms": {
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        "powder": 0
      },
      "entry": [
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          34,
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        [
          37,
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      "vestibule": [
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      "coat": [
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      ],
      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified."
    },
    {
      "id": "B1",
      "building": "B",
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      "area": 828.75,
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        "powder": 0
      },
      "entry": [
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          68.5,
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      "vestibule": [
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      "kitchenWall": [
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      ],
      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified."
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    {
      "id": "B2",
      "building": "B",
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        "powder": 0
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      "entry": [
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      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified."
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      "area": 695,
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      ],
      "kitchenWall": [
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          120,
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      ],
      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified."
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    {
      "id": "C2",
      "building": "C",
      "geometry": [
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      "area": 1250,
      "bedrooms": 2,
      "bathrooms": {
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        "powder": 0
      },
      "entry": [
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          120,
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      ],
      "vestibule": [
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          127,
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          120,
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      ],
      "coat": [
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          127,
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          125,
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      ],
      "kitchenWall": [
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          120,
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      ],
      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified."
    },
    {
      "id": "D1",
      "building": "D",
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      "area": 1500,
      "bedrooms": 3,
      "bathrooms": {
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        "powder": 1
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      "coat": [
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      ],
      "kitchenWall": [
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          108,
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        [
          115,
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      ],
      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified."
    },
    {
      "id": "D2",
      "building": "D",
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              155,
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              138,
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              120,
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              120,
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      ],
      "area": 695,
      "bedrooms": 1,
      "bathrooms": {
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        "powder": 1
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      "entry": [
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          120,
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      ],
      "vestibule": [
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          127,
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      "coat": [
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          127,
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          127,
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        [
          125,
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      ],
      "kitchenWall": [
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          120,
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        ],
        [
          120,
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        ]
      ],
      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified."
    }
  ],
  "homes": [
    {
      "id": "G-A1",
      "building": "A",
      "geometry": [
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            [
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              23.25,
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      "area": 747.75,
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    {
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      "roomStatus": "Gross allocation with entry and courtyard kitchen reservations; full room and furniture fit pending. Bedroom targets are not certified.",
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  ],
  "common": [
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      "id": "D-service",
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      "area": 209
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  "serviceDoors": [
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      "id": "A-service-door",
      "building": "A",
      "segment": [
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      "external": false
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  "streetEntries": [
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    {
      "id": "B-street",
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    {
      "id": "C-street",
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    {
      "id": "D-street",
      "building": "D",
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      "lobbyDoor": [
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  "primaryCores": [
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      "id": "A",
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        [
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      "orientation": "north–south, parallel to side wall",
      "width": 10,
      "length": 18
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    {
      "id": "B",
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        [
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      "orientation": "north–south, parallel to side wall",
      "width": 10,
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    {
      "id": "C",
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      "orientation": "north–south, parallel to side wall",
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      "length": 18
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    {
      "id": "D",
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        [
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      "door": [
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        [
          120,
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      ],
      "orientation": "east–west, parallel to south party wall",
      "width": 10,
      "length": 18
    }
  ],
  "exteriorStairs": [
    {
      "id": "AB-backup",
      "serves": [
        "A",
        "B"
      ],
      "polygon": [
        [
          5,
          42
        ],
        [
          15,
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        [
          15,
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        [
          5,
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      ]
    },
    {
      "id": "CD-backup",
      "serves": [
        "C",
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      "polygon": [
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        [
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      ]
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  ],
  "notes": [
    "Four complete central main cores and dedicated street vestibules replace the two split shared main cores. The two exterior backup stairs and open galleries remain shared; this is four entrance clusters, not a legal subdivision or an elevator exemption.",
    "Street bars remain 40 ft deep. The south wing remains 30 ft wide but is shortened from 40 to 20 ft.",
    "Ground floor has seven connected allocations after street approaches and service reserves are deducted. Five ground homes are conservatively underwritten as 1BD, one as 2BD and one as 3BD; full rooms, coat vestibules, kitchens, baths, accessible routes and fixtures still need design development.",
    "RFP land and four affordable homes are retained. Rents and construction rates are unchanged; area and bedroom mix drive the revised pro forma.",
    "The RFP recommends point-access clusters of six to eight homes. This four-story concept has seven to eight homes per entrance cluster, but connected structure/loggias require Chapter 11 accessibility review.",
    "Stair reservations: 10 × 18 ft gross, two 4-ft flight study widths, 4-ft landings, 18 risers per 10-ft story. Wall/rail thickness, door swings, headroom, exit separation and balcony protection must be coordinated before certification.",
    "No survey supplied. RFP parcel dimensions retained; Cook County GIS context remains approximate."
  ],
  "comparison": {
    "previous": {
      "homes": 35,
      "groundHomes": 8,
      "enclosedSf": 34600,
      "apartmentGrossSf": 31898,
      "coverage": 60.62499999999999,
      "far": 2.515,
      "cost": 13624455,
      "noi": 572380,
      "dscr": 0.8521320282275405,
      "gap": 3949592.9394626208,
      "constructionTarget": 185.82024612846322,
      "affordable": 4,
      "lender": {
        "target": 1.25,
        "maxLtv": 0.8,
        "ncf": 560130,
        "dscr": 0.8338948128360395,
        "ltv": 0.8509631123554281,
        "supportedLoan": 5907908.423153383,
        "extraEquity": 2947987.3268466173,
        "totalEquity": 7716546.576846617
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    },
    "revised": {
      "homes": 31,
      "groundHomes": 7,
      "enclosedSf": 32700,
      "apartmentGrossSf": 29051.507575951968,
      "coverage": 56.875,
      "far": 2.365,
      "cost": 12891655,
      "noi": 463280,
      "dscr": 0.7289142738435097,
      "gap": 5060895.54752829,
      "constructionTarget": 154.08793129949612,
      "affordable": 4,
      "lender": {
        "target": 1.25,
        "maxLtv": 0.8,
        "ncf": 452430,
        "dscr": 0.7118431292415367,
        "ltv": 0.9948123516016233,
        "supportedLoan": 4771954.738877198,
        "extraEquity": 3607621.0111228023,
        "totalEquity": 8119700.261122802
      }
    }
  },
  "project": {
    "address": "4200 S. Indiana Avenue, Chicago",
    "survey": "No validated survey supplied; retained 160 × 100 ft RFP parcel.",
    "gisContext": "/reference/assets/4200-map.png",
    "sitePlan": "/4200-access/site-plan.svg",
    "groundAccess": "/4200-access/ground.svg",
    "upperAccess": "/4200-access/upper.svg",
    "model": "https://chicago-courtyard-rfp.aliciapederson.chatgpt.site/?site=4200&view=massing#current-design"
  },
  "sources": [
    [
      "Chicago Courtyard Buildings RFP · pp. 6–9; land p. 15",
      "https://drive.google.com/file/d/1Bz31Xt0XxR2TaZXX2L6u9s2AgPBdnKZM/view"
    ],
    [
      "Chicago 14B-2: multi-story housing and attached structures",
      "https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2662111"
    ],
    [
      "Chicago Chapter 11: accessibility",
      "https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2665355"
    ],
    [
      "Chicago 1027: exterior exit stairs",
      "https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2665100"
    ],
    [
      "Chicago stairway requirements",
      "https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2664865"
    ],
    [
      "Chicago exit arrangement and separation",
      "https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2664736"
    ],
    [
      "Chicago egress balconies",
      "https://codelibrary.amlegal.com/codes/chicago/latest/chicago_il/0-0-0-2665068"
    ]
  ]
}