Margaret Day Blake Apartments
Multifamily Housing in Chicago, IL · 2140 N Clark St · 60614
At a glance
Margaret Day Blake Apartments is a 71,000-square-foot multifamily housing building at 2140 N Clark St in Chicago, Illinois, built in 1966. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 60 out of 100 (grade C), a site energy-use intensity of 87.5 kBtu/ft² and 451 tCO₂e of greenhouse-gas emissions. That score is higher than 42% 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 | 60 (band C) |
| Site EUI | 87.5 kBtu/ft² |
| Source EUI | 126.2 kBtu/ft² |
| GHG emissions | 451 tCO₂e |
| GHG intensity | 6.3 kgCO₂e/ft² |
| Electricity | 408,166 kWh |
| Natural gas | 48,169 therms |
| Gross floor area | 71,000 sq ft |
| Source record | chicago:250101:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 60 | +1 | 87.5 kBtu/ft² | 451 tCO₂e |
| 2022 | 59 | 95.9 kBtu/ft² | 480 tCO₂e | |
| 2021 | — | — | — | |
| 2020 | 61 | 87.9 kBtu/ft² | 493 tCO₂e | |
| 2019 | — | — | — | |
| 2018 | 51 | +6 | 101.9 kBtu/ft² | 567 tCO₂e |
| 2017 | 45 | -8 | 103.0 kBtu/ft² | 587 tCO₂e |
| 2016 | 53 | 93.9 kBtu/ft² | 581 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.
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Location
- Address
- 2140 N Clark St
- City
- Chicago
- State
- Illinois
- ZIP
- 60614
- Coordinates
- 41.73844, -87.62090
Within ~1 km
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See also: most efficient in Chicago · biggest emitters
How does Margaret Day Blake Apartments 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. Margaret Day Blake Apartments's ENERGY STAR score of 60 compares with an average of 62 across the 1,472 that report a score; it scores higher than 42% of them and lower than 56%. Its site EUI of 87.5 kBtu/ft² is about 22% 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 6.3 kgCO₂e/ft² is roughly in line with the group average of 5.8 kgCO₂e/ft².
At 71,000 sq ft, it is about 66% below the average floor area of 206,097 sq ft for those buildings. It was built in 1966, 5 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 Margaret Day Blake Apartments's energy performance changed over time?
BuildingCensus holds 8 Chicago disclosures for Margaret Day Blake Apartments, covering report years 2016–2023. Its ENERGY STAR score went from 53 in 2016 to 60 in 2023 (+7 points); its best year on file was 2020, at 61. Site EUI moved from 93.9 kBtu/ft² (2016) to 87.5 kBtu/ft² (2023), a 7% decrease. Reported emissions went from 581 tCO₂e to 451 tCO₂e over the same span (down 22%).
What does an ENERGY STAR score of 60 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 60 means the building performs better than about 60% of its national peers. BuildingCensus bands the score into report-card grades; 60 falls in band C — below median (55–69). It sits 15 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. Margaret Day Blake Apartments's 87.5 kBtu/ft² across 71,000 sq ft works out to about 6.2 billion Btu (1,821 MWh-equivalent) in 2023. Its source EUI of 126.2 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 408,166 kWh of electricity and 48,169 therms of natural gas for the year.
Which law requires Margaret Day Blake Apartments to report its energy use?
Margaret Day Blake Apartments 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:250101:2023). Covered buildings that fail to benchmark and report face fines of up to $100 plus $25 per day of violation under the ordinance.
More multifamily housing buildings in Chicago
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Frequently asked questions
What is Margaret Day Blake Apartments's energy grade?
Margaret Day Blake Apartments scores 60 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 Margaret Day Blake Apartments use?
Its 2023 site energy-use intensity was 87.5 kBtu/ft² (126.2 kBtu/ft² source) across 71,000 sq ft, including 408,166 kWh of electricity and 48,169 therms of natural gas.
What are Margaret Day Blake Apartments's carbon emissions?
Margaret Day Blake Apartments reported 451 tCO₂e of greenhouse-gas emissions (6.3 kgCO₂e/ft²) for 2023.
Where is Margaret Day Blake Apartments?
Margaret Day Blake Apartments is at 2140 N Clark St, in Chicago, Illinois 60614. Its coordinates are 41.73844, -87.62090 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is Margaret Day Blake Apartments and when was it built?
Margaret Day Blake Apartments has 71,000 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 1966 as its year built. It is classed as multifamily housing.
Is Margaret Day Blake Apartments 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, “Margaret Day Blake Apartments, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/margaret-day-blake-apartments-9b1ea512 (data as of October 2, 2026).