# 946 East Old Willow Road, Prospect Heights Apartments in Prospect Heights, Illinois. It covers 67,542 square feet on the ground. Rates calibrated October 2, 2026. Review by December 31, 2026. Updated October 9, 2026. Method propdata-estimator-v6. ## This building 946 East Old Willow Road, Prospect Heights. Apartments in Prospect Heights, Illinois. Property ID sphym3c25em0wap. ## Facts **Facts about 946 East Old Willow Road, Prospect Heights** | Fact | Value | Source | | --- | --- | --- | | Address | 946 East Old Willow Road, Prospect Heights, IL 60070 | [USA Structures](https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights/#how-we-know) | | Building type | Apartments | [USA Structures and SkyPSI estimator](https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights/#how-we-know) | | Footprint | 67,542 square feet | [USA Structures](https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights/#how-we-know) | | Perimeter | 3,019.82 feet | [USA Structures](https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights/#how-we-know) | | Height | 25.84 feet | [Overture Maps building footprints and Google Open Buildings](https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights/#how-we-know) | | Stories | 3 stories | [Overture Maps building footprints and Google Open Buildings](https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights/#how-we-know) | | Exterior wall area | 78,036 square feet | [SkyPSI estimator](https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights/#how-we-know) | ## Cost ranges Whole-building ranges from the SkyPSI estimator, calibrated October 2, 2026. Grade C: modelled from the Texas calibration. [What the grades mean](https://skypsi.com/estimates/methodology/confidence-grades/). ### Exterior soft wash **Exterior soft wash from a boom lift, whole building** | Service | Low | Most likely | High | | --- | --- | --- | --- | | Facade wash, conventional access | $8,500 | $15,500 | $25,500 | ## Best method - [Exterior soft wash](https://skypsi.com/estimates/exterior-soft-wash/): Boom lift fits this building, most likely $15,500. ## Similar buildings nearby - [952 East Old Willow Road, Prospect Heights](https://skypsi.com/property/il/chicago/spedmx9rvmncc98-952-east-old-willow-road-prospect-heights/) - [954 East Old Willow Road, Prospect Heights](https://skypsi.com/property/il/chicago/spg6f696zevk2yd-954-east-old-willow-road-prospect-heights/) - [920 East Old Willow Road, Prospect Heights](https://skypsi.com/property/il/chicago/speqg3vvt921ts4-920-east-old-willow-road-prospect-heights/) ## How we know Each fact names the source it comes from. A building file carries the source of each field, and SkyPSI shows that source beside the fact. - [USA Structures](https://disasters.geoplatform.gov/USA_Structures/): Building footprints, heights and occupancy from FEMA's USA Structures. - [Google Open Buildings](https://sites.research.google/open-buildings/): Building outlines and heights from Google Open Buildings, reached through the Overture Maps buildings theme. - [Overture Maps building footprints](https://opendatacommons.org/licenses/odbl/1-0/): Building outlines, heights and floor counts from the Overture Maps buildings theme. - [SkyPSI estimator](https://skypsi.com/estimates/methodology/sources-and-licensing/): SkyPSI's own price model, calibrated rates and building-class rules. Cost ranges come from the SkyPSI estimator, calibrated October 2, 2026. [How a SkyEstimate is built](https://skypsi.com/estimates/methodology/how-a-skyestimate-is-built/). [Request a Quote](https://skypsi.com/request-a-quote) --- Sources: USA Structures, Google Open Buildings, Overture Maps building footprints, SkyPSI estimator. Building footprints: USA Structures, FEMA Response Geospatial Office, Oak Ridge National Laboratory and U.S. Geological Survey (CC BY 4.0). https://disasters.geoplatform.gov/USA_Structures/ Building data from Google Open Buildings, reached through Overture Maps Foundation, overturemaps.org. https://sites.research.google/open-buildings/ Building footprints from Overture Maps Foundation, including OpenStreetMap contributors, Microsoft, Esri Community Maps contributors and USGS, under the Open Database License (ODbL). https://opendatacommons.org/licenses/odbl/1-0/ Page: https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights/ JSON: https://skypsi.com/property/il/chicago/sphym3c25em0wap-946-east-old-willow-road-prospect-heights.json Content license: https://skypsi.com/content-license.txt