Library Tower Condo Association
Multifamily Housing in Chicago, IL · 520 S State Street · 60605
At a glance
Library Tower Condo Association is a 363,761-square-foot multifamily housing building at 520 S State Street in Chicago, Illinois, built in 2008. In its 2023 Chicago benchmarking disclosure it reported an ENERGY STAR score of 89 out of 100 (grade A), a site energy-use intensity of 46.8 kBtu/ft² and 1,475 tCO₂e of greenhouse-gas emissions. That score is higher than 79% 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 | 89 (band A) |
| Site EUI | 46.8 kBtu/ft² |
| Source EUI | 80.8 kBtu/ft² |
| GHG emissions | 1,475 tCO₂e |
| GHG intensity | 4.1 kgCO₂e/ft² |
| Electricity | 1,928,997 kWh |
| Natural gas | 104,379 therms |
| Gross floor area | 363,761 sq ft |
| Source record | chicago:252071:2023 |
The disclosure history
Year over year
| Year | Score | Δ | Site EUI | GHG emissions |
|---|---|---|---|---|
| 2023latest | 89 | ±0 | 46.8 kBtu/ft² | 1,475 tCO₂e |
| 2022 | 89 | +6 | 53.8 kBtu/ft² | 1,581 tCO₂e |
| 2021 | 83 | +11 | 54.6 kBtu/ft² | 1,731 tCO₂e |
| 2020 | 72 | +1 | 61.4 kBtu/ft² | 2,004 tCO₂e |
| 2019 | 71 | ±0 | 66.7 kBtu/ft² | — |
| 2018 | 71 | +7 | 67.5 kBtu/ft² | 2,197 tCO₂e |
| 2017 | 64 | -3 | 63.8 kBtu/ft² | 2,305 tCO₂e |
| 2016 | 67 | +5 | 61.9 kBtu/ft² | 2,359 tCO₂e |
| 2015 | 62 | 63.8 kBtu/ft² | 2,529 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
- 520 S State Street
- City
- Chicago
- State
- Illinois
- ZIP
- 60605
- Coordinates
- 41.87834, -87.62668
Within ~1 km
Nearby benchmarked buildings
- Chase Tower Chicagoscore —
Financial Office · 2,521,929 sq ft
- AMA Plazascore 58
Office · 1,870,680 sq ft
- 71215A State Stscore 45
Retail Store · 1,841,736 sq ft
Multifamily Housing · 1,558,561 sq ft
- Harris Bank Buildingscore —
Building · 1,526,102 sq ft
- The Field Museumscore —
Mixed Use Property · 1,280,537 sq ft
See also: most efficient in Chicago · biggest emitters
How does Library Tower Condo Association 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. Library Tower Condo Association's ENERGY STAR score of 89 compares with an average of 62 across the 1,472 that report a score; it scores higher than 79% of them and lower than 19%. Its site EUI of 46.8 kBtu/ft² is about 35% below the average of 72.0 kBtu/ft² — it uses less energy per square foot than the typical building in that group. Its emissions intensity of 4.1 kgCO₂e/ft² is about 29% below the group average of 5.8 kgCO₂e/ft².
At 363,761 sq ft, it is about 77% above the average floor area of 206,097 sq ft for those buildings. It was built in 2008, 37 years later 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 Library Tower Condo Association's energy performance changed over time?
BuildingCensus holds 9 Chicago disclosures for Library Tower Condo Association, covering report years 2015–2023. Its ENERGY STAR score went from 62 in 2015 to 89 in 2023 (+27 points); its best year on file was 2022, at 89. Site EUI moved from 63.8 kBtu/ft² (2015) to 46.8 kBtu/ft² (2023), a 27% decrease. Reported emissions went from 2,529 tCO₂e to 1,475 tCO₂e over the same span (down 42%).
What does an ENERGY STAR score of 89 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 89 means the building performs better than about 89% of its national peers. BuildingCensus bands the score into report-card grades; 89 falls in band A — high performer (85–100). Scores of 75 or higher meet the threshold for ENERGY STAR certification; certification itself is a separate, verified application that the disclosure does not record. 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. Library Tower Condo Association's 46.8 kBtu/ft² across 363,761 sq ft works out to about 17 billion Btu (4,989 MWh-equivalent) in 2023. Its source EUI of 80.8 kBtu/ft² also counts the energy lost generating and delivering that power, which is why it is higher. The disclosure also reports 1,928,997 kWh of electricity and 104,379 therms of natural gas for the year.
Which law requires Library Tower Condo Association to report its energy use?
Library Tower Condo Association 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:252071:2023). 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
- 3430-40 N Lake Shore· 363,424 sq ft · score 61 (C)
- Lake Meadows 6· 363,053 sq ft · score 1 (D)
- Museum Tower Residences (251218)· 362,406 sq ft · score 71 (B)
- (IL579) - 1550 Condo Association (1550 N. Lake Shore Drive)· 360,258 sq ft · score 51 (D)
- 200 N. Dearborn CA· 359,953 sq ft · score 44 (D)
- Windermere House· 359,018 sq ft · score 84 (B)
- Multifamily Housing buildings in Chicago· 1,515 benchmarked
- All Chicago benchmarked buildings· Building Energy Use Benchmarking Ordinance
- Most efficient large buildings in Chicago
- Least efficient large buildings in Chicago
- Biggest emitters in Chicago
Frequently asked questions
What is Library Tower Condo Association's energy grade?
Library Tower Condo Association scores 89 out of 100 on ENERGY STAR — band A, high performer (85–100) — in its 2023 Chicago disclosure. Scores are national percentiles against similar buildings; 75+ qualifies for ENERGY STAR certification.
How much energy does Library Tower Condo Association use?
Its 2023 site energy-use intensity was 46.8 kBtu/ft² (80.8 kBtu/ft² source) across 363,761 sq ft, including 1,928,997 kWh of electricity and 104,379 therms of natural gas.
What are Library Tower Condo Association's carbon emissions?
Library Tower Condo Association reported 1,475 tCO₂e of greenhouse-gas emissions (4.1 kgCO₂e/ft²) for 2023.
Where is Library Tower Condo Association?
Library Tower Condo Association is at 520 S State Street, in Chicago, Illinois 60605. Its coordinates are 41.87834, -87.62668 (latitude, longitude), as published in the Chicago Energy Benchmarking file.
How big is Library Tower Condo Association and when was it built?
Library Tower Condo Association has 363,761 sq ft of gross floor area, as reported in its 2023 disclosure. The disclosure lists 2008 as its year built. It is classed as multifamily housing.
Is Library Tower Condo Association 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, “Library Tower Condo Association, Chicago, Illinois — 2023 benchmarking disclosure”, https://buildingcensus.com/buildings/chicago/library-tower-condo-association-ce130a17 (data as of October 2, 2026).