When you go under contract on a Denver condo, which document tells you how the building will meet the city's energy targets? The seller's stack of association documents probably won't. The current Colorado Contract to Buy and Sell Real Estate was adopted August 5, 2025, and its use became mandatory January 1, 2026. Its list of association documents covers governing instruments, minutes, insurance, regular and special assessments, the operating budget, financial statements, reserves, and a reserve study if the HOA has one. Nowhere does it list Energize Denver benchmarking or performance records.
That gap matters more than most buyers expect. Under the city's rules, two condo buildings with similar prices and similar dues can be on very different compliance paths. A building's size and whether each unit has its own heating and hot water determine which compliance routes its HOA can choose. How the reserve fund compares with the reserve study's recommendation affects whether the HOA can ask for more time. A listing typically shows none of these.
Where the rules stand in November 2026
Energize Denver covers commercial and multifamily buildings of 5,000 square feet and up. The large-building tier starts at 25,000 square feet. The city's policy page says the program doesn't mandate early HVAC replacement or electrification. The current rules and regulations took effect August 27, 2026. They set targets for 2025, 2027 and 2030 unless a building has an approved alternate compliance option or a timeline extension, and the citywide 2030 goal is 30% weather-normalized site energy savings.
Most buildings are actually working on a later calendar. The April 1, 2025 rule update offered qualifying owners an extension that moves the first interim target to 2028, drops the 2027 interim target, and pushes the final target from 2030 to 2032. The same update capped any building's required energy reduction at 42%, cut large-building penalty rates by half, and said performance penalties would not be levied until late 2029. The city says ordinance changes finalized in May 2026 codified the penalty reduction and added a 90-day cure period before citations. The latest technical guidance, Version 4.0, is dated September 1, 2026, and it contains the condo provisions described below.
The program also faces a court challenge. The Denver Post, reporting with BusinessDen on October 2, 2026, said U.S. District Judge Regina Rodriguez dismissed the industry groups' challenge to the consumer appliance rules but let their lawsuit against the building-wide standards proceed. The same report gave the city's newest compliance figures. As of that report, 47% of buildings over 25,000 square feet already met the 2032 targets, up from 35% a year earlier, and 69% met the standard they'll face in 2028.
So roughly half of large buildings have already met the final target. The question for a condo buyer is which half a particular building is in, and what its HOA can do about it if it's behind.
Condo HOAs get their own option, but not every building qualifies
The city wrote a compliance option specifically for residential condominiums of 25,000 square feet and larger. The HOA can pick one of two routes. The first is a target adjustment that caps the building's final goal at a 15% energy reduction from its baseline year, which the building then has to maintain indefinitely. The second is a prescriptive route: the HOA completes energy efficiency measures estimated to cut energy use by at least 15%, and that one-time project replaces any ongoing requirement to hold an energy-use score. Annual benchmarking continues on either route.
Eligibility comes down to size and plumbing. The guidance limits both routes to condo buildings between 25,000 and 49,999 square feet that are compliant with their latest benchmarking submission, and to buildings of 50,000 square feet or more where every unit has its own domestic hot water system and its own heating and cooling.
Larger condos with shared central systems don't qualify. The guidance says buildings of 50,000 square feet and up that share central hot water or space heating or cooling are also subject to Colorado's statewide building performance standard. As of the guidance's publication, the state's multifamily target was 42.1 EUI, stricter than Denver's 44.2. The Colorado Energy Office says that for buildings covered by both programs, meeting Energize Denver's efficiency requirement counts toward the state target, but owners still file benchmarking with both programs and pay state fees.
| Building profile | 15% target or prescriptive route? | Extra layer |
|---|---|---|
| 25,000 to 49,999 sq ft, benchmarking current | Eligible | None beyond Denver |
| 50,000+ sq ft, every unit has its own hot water and HVAC, benchmarking current | Eligible, with proof of mechanical setup | Explained in guidance as preserving state deemed compliance |
| 50,000+ sq ft, shared central hot water or heating/cooling | Not eligible for these routes | Colorado's building performance standard also applies |
Every profile in that table can still apply for a timeline extension. Even within the prescriptive route, equipment choices are restricted. A like-for-like gas boiler replacement doesn't count as a prescriptive measure, though the guidance allows it under the target adjustment route. For a building with an aging central boiler, then, the choice of route shapes the next major equipment decision.
The city's public dataset shows why this matters across the condo market. Watertower Lofts at 2960 Inca St. is recorded as built in 1896 with 112,512 square feet. Fire Clay at 3225 Blake St. is recorded as built in 2002 with 29,851 square feet. Highland Lofts at 1925 W. 32nd Ave. is listed at 36,258 square feet. All three are condominium buildings, and all three are covered. On size alone, the two smaller buildings fall in the band where eligibility depends on benchmarking compliance. For the larger building, eligibility depends on how its heat and hot water are delivered, which no photo gallery shows.
A thin reserve fund can buy time, and also signal costs ahead
The condo extension is where the financial side shows up. Any residential condominium of 25,000 square feet or more can ask for more time if its capital reserves are below 30% of what its reserve study recommends for the identified work, or if it needs time to raise money for efficiency projects or major equipment through dues or special assessments. An HOA that applies on reserve grounds has to submit a fundraising plan explaining what funding it needs, how it will collect it, and on what timeline. The guidance includes a sample timeline extended to 2035.
So the same paperwork that gives an underfunded building more time also lays out how its owners will be asked to pay. An approved extension shows up in the city's public records, and a fundraising plan built on dues or assessments is the kind of thing that appears in board minutes.
The litigation shows the scale of building-system costs, though none of these figures come from condos. The Denver Post/BusinessDen report said the lawsuit puts the Belmont Buckingham apartment building in Capitol Hill at $540,000 for new boilers and more than $1 million in total upgrades, and the 1300 Apartments in Congress Park at $440,000, according to property manager Cornerstone. Those are rental buildings, and the figures are estimates filed in court.
How to check a building before you're under contract
Colorado's disclosure rules got somewhat stronger this year. The current CCIOA compilation posted by the Colorado Division of Real Estate shows that HB 26-1099, effective August 12, 2026, added the most recent reserve study to the annual disclosures associations make to owners. The energy side you largely have to look up yourself:
- Search the building in the city's Performance Lookup Tool. It shows benchmarking status and performance status in separate sections, along with site EUI, targets, and whether the city approved a target adjustment or timeline extension. One example in the tool, 3509 S. Glencoe St. at 45,358 square feet, shows benchmarking in compliance, a current site EUI of 50.6 against a 2032 final target of 48.1, an approved target adjustment, and a performance status of "pre evaluation." Being "in compliance" on benchmarking doesn't mean the building has met its performance target.
- Download the Energize Denver master dataset. It was last updated September 22, 2026 and lists year built, square footage, property type, ENERGY STAR score, EUI, and baseline, interim and final targets for each building. Use it to compare buildings on your shortlist.
- Compare the reserve study with the 30% line. If reserves are well below what the study recommends, read the board minutes for any extension request or fundraising plan.
- Ask the HOA directly which compliance route it chose or plans to choose, and whether the building runs central or in-unit heating and hot water. These questions aren't on the contract's document list, so you have to make them a separate request.
For context, the city's technical guidance requires Energize Denver disclosure and a portfolio transfer when an entire covered building is sold. Colorado has a separate Energy Benchmarking Disclosure form for state-covered buildings of 50,000 square feet or more.
Quick questions
Does Energize Denver apply to a condo building under 25,000 square feet?
Buildings from 5,000 to 24,999 square feet fall under a separate small-building tier. The condo option described here applies only to buildings of 25,000 square feet and up.
When could penalties start?
Under the April 2025 update, performance penalties won't be levied until late 2029, and the May 2026 changes added a 90-day cure period before citations.
If the HOA chooses the prescriptive route, when is the work due?
By the building's current final deadline. For a 2032 target, that means measures completed by December 31, 2032, and documentation submitted by June 1, 2033.
This post is general information, not legal, tax or financial advice. Please confirm how these rules apply to a specific building and purchase with an attorney, the HOA, or the right professional.
If you own a unit in one of Denver's larger condo buildings and are thinking about selling, buyers may ask about your building's Energize Denver status. The Billy Van Heusen Team can pull the public lookup for your building, go through the association documents with you, and price your home with those answers ready. Get Your Free Home Valuation, and we'll begin with your building's record.
