Carbon Lighthouse

AI that makes it profitable to decarbonize commercial real esta...


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Carbon Lighthouse uses its patented AI platform, called CLUES, to provide commercial real estate investors a profitable and easy path to decarbonization.


Carbon Lighthouse solves these problems through its award-winning CLUES AI platform, creating a profitable and easy path to decarbonization for commercial real estate firms.

The outputs of Carbon Lighthouse’s software are what make the firm categorically different from the rest of market. For every building in the client’s portfolio, Carbon Lighthouse provides 1) actionable scopes of work to achieve science-based targets for CO2 reductions, that 2) provide a return on investment far exceeding market.

Additionally, the financials are bankable: for leases where the tenants would get all the benefits, Carbon Lighthouse pays rent direct to the landlord. If savings are less than expected, Carbon Lighthouse writes a check to cover the difference. Roughly 1.5% of revenue to date has been refunded due to missed guarantees.


Data is key to Carbon Lighthouse’s platform, specifically a robust and proprietary data set that has never before existed.

Carbon Lighthouse has deployed thousands of sensors in hundreds of buildings, continuously amassing ever more data. Importantly, this data is different in kind than what other firms collect, not just more numerous. The firm collects data from building management systems (if there is one), but also electrical data, flow data (air, heating water, chilled water, compressed air, more), pressure, temperature, humidities, light levels, occupancy, and more.

This data, combined with input from the facilities team directly, enables CLUES to determine the specific scope of work applicable to each building at a level of detail that is a) actionable (language can be dropped into RFPs for contractors), and b) bankable (Carbon Lighthouse can take financial risk, backstopped by MunichRE).



land and expand success rate

customers including 10 of 38 largest real estate firms in the world (>$120m in Expansion ARR Opportunities):

And dozens more!


Carbon Lighthouse’s Ventas deals exemplifies the portfolio-wide solutions we are winning.

Ventas (NYSE: VTR) is the second-largest healthcare REIT investing in senior housing, outpatient medical, and health systems with a market cap of $22 billion.


Award-winning innovations:
Carbon Lighthouse and its patented CLUES AI platform have won multiple awards including the AI Breakthrough Award (2 years in a row), Fast Company’s Most Innovative Company Award, the 2020 Global Cleantech 100 List, Globe Street’s 50 Under 40, Fast Company’s World Changing Ideas Award, Frost & Sullivan’s Best Practices Award, and AWS’s AI Awards.

Carbon Lighthouse has been adopted by 150+ real estate firms, including:
Private Equity Real Estate: Goldman Sachs, Carlyle, Shopcore (subsidiary of Blackstone), L&B, more
REITs: Kilroy, Ventas, A&B, more
Family Offices: Swig (owns more office than most REITs), Durst (owns the Freedom Tower in NYC)

Immense growth potential:
Carbon Lighthouse is in early-stage discussions with channel partners that could help expand the business 100x – 1,000x, though these are nascent.


Raphael Rosen
Co-founder and CEO

  • Previously helped build a solar company from $0 in revenue to $25M in revenue
  • Former Forbes 30 Under 30 Fellow, Stanford StartX Fellow, and Echoing Green Fellow
  • Was once selected by Nickelodeon Studios to “Get Gacked”
  • BA in History and Physics from Harvard University, MS in Physics from Cambridge University

Brenden Millstein
Co-founder and President

  • Previously co-administered $90M energy efficiency program for the State of New York, based in Manhattan
  • Former Forbes 30 Under 30 Fellow, Stanford StartX Fellow, Stanford Social Innovation Fellow, and Echoing Green Fellow
  • Once opened as a breakdancer for multi-platinum rapper Busta Rhymes
  • BA in Physics from Harvard, MS in Engineering from Stanford, and MBA from Stanford

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