Twin Towers Apartments LLC
Multifamily Housing in Chicago, IL · 1645-49 E 50th Street · 60615
At a glance
Twin Towers Apartments LLC is a 217,600-square-foot multifamily housing building at 1645-49 E 50th Street in Chicago, Illinois, built in 1951. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 62 out of 100 (grade C), a site energy-use intensity of 84.1 kBtu/ft² and 1,355 tCO₂e of greenhouse-gas emissions. That score is higher than 45% of the 1,472 scored multifamily housing buildings in Chicago.
Building Energy Use Benchmarking Ordinance · reporting year 2023
Benchmarking record
| Field | Value |
|---|---|
| ENERGY STAR score | 62 (band C) |
| Site EUI | 84.1 kBtu/ft² |
| Source EUI | 123.7 kBtu/ft² |
| GHG emissions | 1,355 tCO₂e |
| GHG intensity | 6.2 kgCO₂e/ft² |
| Electricity | 1,291,228 kWh |
| Natural gas | 138,959 therms |
| Gross floor area | 217,600 sq ft |
| Source record | chicago:159924:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 62 | -3 | 84.1 kBtu/ft² | 1,355 tCO₂e |
| 2022 | 65 | -1 | 89.4 kBtu/ft² | 1,404 tCO₂e |
| 2021 | 66 | -8 | 84.1 kBtu/ft² | 1,402 tCO₂e |
| 2020 | 74 | ±0 | 79.4 kBtu/ft² | 1,372 tCO₂e |
| 2019 | 74 | ±0 | 81.8 kBtu/ft² | — |
| 2018 | 74 | +28 | 81.3 kBtu/ft² | 1,484 tCO₂e |
| 2017 | 46 | ±0 | 83.7 kBtu/ft² | 1,836 tCO₂e |
| 2016 | 46 | 86.1 kBtu/ft² | 1,891 tCO₂e |
Compliance context
Building Energy Use Benchmarking Ordinance
Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.
Ownership
No owning organisation shown. Names of private individuals in the disclosure are not published here.
Own or manage this building? Claim it to correct the record and get compliance alerts.
Location
- Address
- 1645-49 E 50th Street
- City
- Chicago
- State
- Illinois
- ZIP
- 60615
- Coordinates
- 41.90600, -87.65044
Within ~1 km
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How does Twin Towers Apartments LLC compare with other multifamily housing buildings in Chicago?
The latest disclosures cover 1,515 multifamily housing buildings in Chicago, out of 3,852 buildings citywide. Twin Towers Apartments LLC's ENERGY STAR score of 62 compares with an average of 62 across the 1,472 that report a score; it scores higher than 45% of them and lower than 53%. Its site EUI of 84.1 kBtu/ft² is about 17% above the average of 72.0 kBtu/ft² — it uses more energy per square foot than the typical building in that group. Its emissions intensity of 6.2 kgCO₂e/ft² is roughly in line with the group average of 5.8 kgCO₂e/ft².
At 217,600 sq ft, it is roughly in line with the average floor area of 206,097 sq ft for those buildings. It was built in 1951, 20 years earlier than the group's average year built (1971). Across all 24 jurisdictions BuildingCensus covers, the 59,945 multifamily housing buildings average an ENERGY STAR score of 70 and a site EUI of 59.0 kBtu/ft².
How has Twin Towers Apartments LLC's energy performance changed over time?
BuildingCensus holds 8 Chicago disclosures for Twin Towers Apartments LLC, covering report years 2016–2023. Its ENERGY STAR score went from 46 in 2016 to 62 in 2023 (+16 points); its best year on file was 2018, at 74. Site EUI moved from 86.1 kBtu/ft² (2016) to 84.1 kBtu/ft² (2023), a 2% decrease. Reported emissions went from 1,891 tCO₂e to 1,355 tCO₂e over the same span (down 28%).
What does an ENERGY STAR score of 62 mean?
ENERGY STAR scores run from 1 to 100 and are computed by the EPA's Portfolio Manager as a percentile against similar buildings nationwide, adjusted for climate, size and use: a score of 62 means the building performs better than about 62% of its national peers. BuildingCensus bands the score into report-card grades; 62 falls in band C — below median (55–69). It sits 13 points below 75, the threshold for ENERGY STAR certification. In Chicago, 35% of scored buildings are at 75 or above.
Site energy-use intensity (EUI) is the energy a building uses on site in a year divided by its floor area, in thousand Btu per square foot — lower is more efficient. Twin Towers Apartments LLC's 84.1 kBtu/ft² across 217,600 sq ft works out to about 18.3 billion Btu (5,363 MWh-equivalent) in 2023. Its source EUI of 123.7 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,291,228 kWh of electricity and 138,959 therms of natural gas for the year.
Which law requires Twin Towers Apartments LLC to report its energy use?
Twin Towers Apartments LLC reports under the Building Energy Use Benchmarking Ordinance, the legal basis of the Chicago Energy Benchmarking program, which publishes each covered building's annual benchmarking results. The record shown here is the report-year 2023 disclosure (source record chicago:159924:2023). Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.
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Frequently asked questions
What is Twin Towers Apartments LLC's energy grade?
Twin Towers Apartments LLC scores 62 out of 100 on ENERGY STAR — band C, below median (55–69) — in its 2023 Chicago disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Twin Towers Apartments LLC use?
Its 2023 site energy-use intensity was 84.1 kBtu/ft² (123.7 kBtu/ft² source) across 217,600 sq ft, including 1,291,228 kWh of electricity and 138,959 therms of natural gas.
What are Twin Towers Apartments LLC's carbon emissions?
Twin Towers Apartments LLC reported 1,355 tCO₂e of greenhouse-gas emissions (6.2 kgCO₂e/ft²) for 2023.
Where is Twin Towers Apartments LLC?
Twin Towers Apartments LLC is at 1645-49 E 50th Street, in Chicago, Illinois 60615. Its coordinates are 41.90600, -87.65044 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is Twin Towers Apartments LLC and when was it built?
Twin Towers Apartments LLC has 217,600 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1951 as its year built. It is classed as multifamily housing.
Is Twin Towers Apartments LLC covered by the Building Energy Use Benchmarking Ordinance?
Yes — it appears in the 2023 Chicago Energy Benchmarking disclosure, which lists the buildings reporting under the Building Energy Use Benchmarking Ordinance.
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About this data
Source: Chicago Energy Benchmarking (Building Energy Use Benchmarking Ordinance), as published October 2, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: BuildingCensus, “Twin Towers Apartments LLC, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/twin-towers-apartments-llc-9e275cd2 (data as of October 2, 2026).