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HARTFORDBUSINESS.COM | DECEMBER 1, 2025 23 The Lists The company that builds and installs the critical systems in virtually every type of facility is the same company you can rely on to maintain them. For over over 50 years, our clients have trusted us to deliver end-to-end facilities solutions, so they can focus on their core business. We design, install, and maintain systems in: Industrial, Manufacturing, Commercial, Higher Education, Healthcare, and Pharmaceutical facilities. WE FOCUS ON YOUR FACILITIES— SO YOU CAN FOCUS ON YOUR BUSINESS. MECHANICAL | ELECTRICAL | PLUMBING | SHEET METAL | BUILDING AUTOMATION | FACILITIES SERVICES 860.871.1111 Toll Free: 800.741.6367 nemsi.com License #'s: E1-197483 S1-406020 P1-290301 SM1-975 MC-1134 LEED-certified buildings in Connecticut Ranked by the most recently certified Rank Building Certification date/ registration date Certification level Square footage Project type 1 Yale University Chemical Safety Building 295 Prospect St. New Haven 06511 Oct. 28, 2025 Jan. 17, 2023 Gold 21,215 Higher education; storage and safety facility 2 Yale University Kline Tower 219 Prospect St. New Haven 06511 Oct. 7, 2025 April 29, 2019 Gold 182,870 Higher education; core learning and office renovation 3 Quinnipiac University The Grove Residence Hall 275 Mount Carmel Ave. Hamden 06518 Sept. 26, 2025 Aug. 25, 2022 Gold 110,000 Higher education; residence hall 4 Crescent Crossings 552 Crescent Ave. Bridgeport 06604 Sept. 4, 2025 Oct. 11, 2023 Gold 99,056 Multifamily residential complex 5 Northern Trust Office 301 Tresser Boulevard, 14th floor Stamford 06901 Aug. 8, 2025 June 26, 2025 Certified 10,550 Office space 6 Wellington at Madison 131 Cottage Road - Units 18-20 and Bldgs. B, D & E Madison 06443 July 14, 2025 Feb. 27, 2024 Platinum 25,954 (1) Affordable multifamily residential complex 7 80 South Road 80 & 90 South Road Farmington 06032 June 19, 2025 May 12, 2023 Gold 73,727 (2) Multifamily residential complex 8 UBS Stamford Branch 600 Washington Blvd., 9th Floor Stamford 06901 May 15, 2025 Nov. 12, 2021 Silver 17,250 Office space 9 Yale University Wu Tsai Institute 100 College St. New Haven 06510 March 20, 2025 July 30, 2021 Gold 37,800 Higher education; core learning space 9 Yale University Psychology Department 100 College St. New Haven 06510 March 20, 2025 Feb. 3, 2021 Gold 83,480 Higher education; core learning space 11 419 West Ave. Stamford Office Building 419 West Ave. Stamford 06902 March 12, 2025 July 12, 2022 Certified 78,575 Office building 12 Cigna Headquarters 900 Cottage Grove Bloomfield 06002 Jan. 10, 2025 April 9, 2024 Gold 893,447 Office space 13 Alexion 101 College St. New Haven 06901 Dec. 3, 2024 Oct. 19, 2022 Platinum 65,500 Research and office space 14 Franklin Templeton 100 First Stamford Place Stamford 06902 Nov. 27, 2024 June 15, 2023 Silver 65,500 Office space 15 Mill River Whittingham Discovery Center 1040 Washington Blvd. Stamford 06901 Oct. 30, 2024 Dec. 9, 2020 Platinum 7,889 Visitor and environmental education center 16 UConn Supplemental Utility Plant 2390 Alumni Drive Storrs 06269 (3) Oct. 17, 2024 Aug. 13, 2019 Gold 37,753 Higher education; utilities 17 Yale University 100 College St., Floors 2, 3, 10 New Haven 06510 Sept. 24, 2024 July 30, 2021 Gold 110,966 Higher education; core learning space 18 Fairfield University Bowman Hall 1073 North Benson Road Fairfield 06824 Aug. 1, 2024 July 26, 2022 Gold 46,184 Higher education; residence hall 19 Yale Peabody Museum of Natural History 170 Whitney Ave. New Haven 06520 July 29, 2024 April 3, 2018 Gold 141,000 Higher education; museum renovation 20 Wesleyan University Public Affairs Center 238 Church St. Middletown 06457 July 1, 2024 Feb. 6, 2019 Gold 74,666 Higher education; core learning and office space 21 Strawberry Hill School (4) 200 Strawberry Hill Ave. Stamford 06902 May 1, 2024 March 29, 2016 Gold 125,968 Primary education: renovation and new contruction 22 Apollo Global Management 100 West Putnam Ave. Greenwich 06830 March 26, 2024 Oct. 6, 2021 Silver 31,800 Office space renovation 23 Quinnipiac University Recreation and Wellness Center 275 Mount Carmel Ave. Hamden 06518 Feb. 13, 2024 Jan. 9, 2021 Gold 56,000 Higher education; new wellness and learning space 24 Yale University W-CSC ESC II - Phase 1 (5) 810 West Campus Drive New Haven 06516 Jan. 3, 2024 Oct. 14, 2014 Silver 24,359 Higher education; core learning space Source: U.S. Green Building Council as of Nov. 4, 2025, news reports and organization websites. Note: Excludes neighborhood development and single-family residential buildings. (1) Combined area for six buildings. (2) Combined area for two buildings. (3) Project is filed under UConn Foundation address. (4) An extension of the Rogers International Magnet School. (5) W-CSC ESC II is West campus Collections Studies Center, Energy Sciences Center II. -Compiled by Heide Martin, hmartin@nebusinessmedia.com New Haven 06511 2 Yale University Kline Tower 219 Prospect St. New Haven 06511 Oct. 7, 2025 April 29, 2019 Gold 182,870 Higher education; core learning and office renovation 3 Quinnipiac University The Grove Residence Hall 275 Mount Carmel Ave. Hamden 06518 Sept. 26, 2025 Aug. 25, 2022 Gold 110,000 Higher education; residence hall 4 Crescent Crossings 552 Crescent Ave. Bridgeport 06604 Sept. 4, 2025 Oct. 11, 2023 Gold 99,056 Multifamily residential complex 5 Northern Trust Office 301 Tresser Boulevard, 14th floor Stamford 06901 Aug. 8, 2025 June 26, 2025 Certified 10,550 Office space 6 Wellington at Madison 131 Cottage Road - Units 18-20 and Bldgs. B, D & E Madison 06443 July 14, 2025 Feb. 27, 2024 Platinum 25,954 (1) Affordable multifamily residential complex 7 80 South Road 80 & 90 South Road Farmington 06032 June 19, 2025 May 12, 2023 Gold 73,727 (2) Multifamily residential complex 8 UBS Stamford Branch 600 Washington Blvd., 9th Floor Stamford 06901 May 15, 2025 Nov. 12, 2021 Silver 17,250 Office space 9 Yale University Wu Tsai Institute 100 College St. New Haven 06510 March 20, 2025 July 30, 2021 Gold 37,800 Higher education; core learning space 9 Yale University Psychology Department 100 College St. New Haven 06510 March 20, 2025 Feb. 3, 2021 Gold 83,480 Higher education; core learning space 11 419 West Ave. Stamford Office Building 419 West Ave. Stamford 06902 March 12, 2025 July 12, 2022 Certified 78,575 Office building 12 Cigna Headquarters 900 Cottage Grove Bloomfield 06002 Jan. 10, 2025 April 9, 2024 Gold 893,447 Office space 13 Alexion 101 College St. New Haven 06901 Dec. 3, 2024 Oct. 19, 2022 Platinum 65,500 Research and office space 14 Franklin Templeton 100 First Stamford Place Stamford 06902 Nov. 27, 2024 June 15, 2023 Silver 65,500 Office space 15 Mill River Whittingham Discovery Center 1040 Washington Blvd. Stamford 06901 Oct. 30, 2024 Dec. 9, 2020 Platinum 7,889 Visitor and environmental education center 16 UConn Supplemental Utility Plant 2390 Alumni Drive Storrs 06269 (3) Oct. 17, 2024 Aug. 13, 2019 Gold 37,753 Higher education; utilities 17 Yale University 100 College St., Floors 2, 3, 10 New Haven 06510 Sept. 24, 2024 July 30, 2021 Gold 110,966 Higher education; core learning space 18 Fairfield University Bowman Hall 1073 North Benson Road Fairfield 06824 Aug. 1, 2024 July 26, 2022 Gold 46,184 Higher education; residence hall 19 Yale Peabody Museum of Natural History 170 Whitney Ave. New Haven 06520 July 29, 2024 April 3, 2018 Gold 141,000 Higher education; museum renovation 20 Wesleyan University Public Affairs Center 238 Church St. Middletown 06457 July 1, 2024 Feb. 6, 2019 Gold 74,666 Higher education; core learning and office space 21 Strawberry Hill School (4) 200 Strawberry Hill Ave. Stamford 06902 May 1, 2024 March 29, 2016 Gold 125,968 Primary education: renovation and new contruction 22 Apollo Global Management 100 West Putnam Ave. Greenwich 06830 March 26, 2024 Oct. 6, 2021 Silver 31,800 Office space renovation 23 Quinnipiac University Recreation and Wellness Center 275 Mount Carmel Ave. Hamden 06518 Feb. 13, 2024 Jan. 9, 2021 Gold 56,000 Higher education; new wellness and learning space 24 Yale University W-CSC ESC II - Phase 1 (5) 810 West Campus Drive New Haven 06516 Jan. 3, 2024 Oct. 14, 2014 Silver 24,359 Higher education; core learning space Source: U.S. Green Building Council as of Nov. 4, 2025, news reports and organization websites. Note: Excludes neighborhood development and single-family residential buildings. (1) Combined area for six buildings. (2) Combined area for two buildings. (3) Project is filed under UConn Foundation address. (4) An extension of the Rogers International Magnet School. (5) W-CSC ESC II is West campus Collections Studies Center, Energy Sciences Center II. -Compiled by Heide Martin, hmartin@nebusinessmedia.com 2 Yale University Kline Tower 219 Prospect St. New Haven 06511 Oct. 7, 2025 April 29, 2019 Gold 182,870 Higher education; core learning and 3 Quinnipiac University The Grove Residence Hall 275 Mount Carmel Ave. Hamden 06518 Sept. 26, 2025 Aug. 25, 2022 Gold 110,000 Higher education; residence hall 4 Crescent Crossings 552 Crescent Ave. Bridgeport 06604 Sept. 4, 2025 Oct. 11, 2023 Gold 99,056 Multifamily residential complex 5 Northern Trust Office 301 Tresser Boulevard, 14th floor Stamford 06901 Aug. 8, 2025 June 26, 2025 Certified 10,550 Office space 6 Wellington at Madison 131 Cottage Road - Units 18-20 and Bldgs. B, D & E Madison 06443 July 14, 2025 Feb. 27, 2024 Platinum 25,954 (1) Affordable multifamily residential 7 80 South Road 80 & 90 South Road Farmington 06032 June 19, 2025 May 12, 2023 Gold 73,727 (2) Multifamily residential complex 8 UBS Stamford Branch 600 Washington Blvd., 9th Floor Stamford 06901 May 15, 2025 Nov. 12, 2021 Silver 17,250 Office space 9 Yale University Wu Tsai Institute 100 College St. New Haven 06510 March 20, 2025 July 30, 2021 Gold 37,800 Higher education; core learning space 9 Yale University Psychology Department 100 College St. New Haven 06510 March 20, 2025 Feb. 3, 2021 Gold 83,480 Higher education; core learning space 11 419 West Ave. Stamford Office Building 419 West Ave. Stamford 06902 March 12, 2025 July 12, 2022 Certified 78,575 Office building 12 Cigna Headquarters 900 Cottage Grove Bloomfield 06002 Jan. 10, 2025 April 9, 2024 Gold 893,447 Office space 13 Alexion 101 College St. New Haven 06901 Dec. 3, 2024 Oct. 19, 2022 Platinum 65,500 Research and office space 14 Franklin Templeton 100 First Stamford Place Stamford 06902 Nov. 27, 2024 June 15, 2023 Silver 65,500 Office space 15 Mill River Whittingham Discovery Center 1040 Washington Blvd. Stamford 06901 Oct. 30, 2024 Dec. 9, 2020 Platinum 7,889 Visitor and environmental education 16 UConn Supplemental Utility Plant 2390 Alumni Drive Storrs 06269 (3) Oct. 17, 2024 Aug. 13, 2019 Gold 37,753 Higher education; utilities 17 Yale University 100 College St., Floors 2, 3, 10 New Haven 06510 Sept. 24, 2024 July 30, 2021 Gold 110,966 Higher education; core learning space 18 Fairfield University Bowman Hall 1073 North Benson Road Fairfield 06824 Aug. 1, 2024 July 26, 2022 Gold 46,184 Higher education; residence hall 19 Yale Peabody Museum of Natural History 170 Whitney Ave. New Haven 06520 July 29, 2024 April 3, 2018 Gold 141,000 Higher education; museum renovation 20 Wesleyan University Public Affairs Center 238 Church St. Middletown 06457 July 1, 2024 Feb. 6, 2019 Gold 74,666 Higher education; core learning and 21 Strawberry Hill School (4) 200 Strawberry Hill Ave. Stamford 06902 May 1, 2024 March 29, 2016 Gold 125,968 Primary education: renovation and 22 Apollo Global Management 100 West Putnam Ave. Greenwich 06830 March 26, 2024 Oct. 6, 2021 Silver 31,800 Office space renovation 23 Quinnipiac University Recreation and Wellness Center 275 Mount Carmel Ave. Hamden 06518 Feb. 13, 2024 Jan. 9, 2021 Gold 56,000 Higher education; new wellness and 24 Yale University W-CSC ESC II - Phase 1 (5) 810 West Campus Drive New Haven 06516 Jan. 3, 2024 Oct. 14, 2014 Silver 24,359 Higher education; core learning space Source: U.S. Green Building Council as of Nov. 4, 2025, news reports and organization websites. Note: Excludes neighborhood development and single-family residential buildings. (1) Combined area for six buildings. (2) Combined area for two buildings. (3) Project is filed under UConn Foundation address. (4) An extension of the Rogers International Magnet School. (5) W-CSC ESC II is West campus Collections Studies Center, Energy Sciences -Compiled by Heide Martin, hmartin@nebusinessmedia.com 1 New Haven 06511 Jan. 17, 2023 2 Yale University Kline Tower 219 Prospect St. New Haven 06511 Oct. 7, 2025 April 29, 2019 Gold 182,870 Higher education; core learning and office renovation 3 Quinnipiac University The Grove Residence Hall 275 Mount Carmel Ave. Hamden 06518 Sept. 26, 2025 Aug. 25, 2022 Gold 110,000 Higher education; residence hall 4 Crescent Crossings 552 Crescent Ave. Bridgeport 06604 Sept. 4, 2025 Oct. 11, 2023 Gold 99,056 Multifamily residential complex 5 Northern Trust Office 301 Tresser Boulevard, 14th floor Stamford 06901 Aug. 8, 2025 June 26, 2025 Certified 10,550 Office space 6 Wellington at Madison 131 Cottage Road - Units 18-20 and Bldgs. B, D & E Madison 06443 July 14, 2025 Feb. 27, 2024 Platinum 25,954 (1) Affordable multifamily residential complex 7 80 South Road 80 & 90 South Road Farmington 06032 June 19, 2025 May 12, 2023 Gold 73,727 (2) Multifamily residential complex 8 UBS Stamford Branch 600 Washington Blvd., 9th Floor Stamford 06901 May 15, 2025 Nov. 12, 2021 Silver 17,250 Office space 9 Yale University Wu Tsai Institute 100 College St. New Haven 06510 March 20, 2025 July 30, 2021 Gold 37,800 Higher education; core learning space 9 Yale University Psychology Department 100 College St. New Haven 06510 March 20, 2025 Feb. 3, 2021 Gold 83,480 Higher education; core learning space 11 419 West Ave. Stamford Office Building 419 West Ave. Stamford 06902 March 12, 2025 July 12, 2022 Certified 78,575 Office building 12 Cigna Headquarters 900 Cottage Grove Bloomfield 06002 Jan. 10, 2025 April 9, 2024 Gold 893,447 Office space 13 Alexion 101 College St. New Haven 06901 Dec. 3, 2024 Oct. 19, 2022 Platinum 65,500 Research and office space 14 Franklin Templeton 100 First Stamford Place Stamford 06902 Nov. 27, 2024 June 15, 2023 Silver 65,500 Office space 15 Mill River Whittingham Discovery Center 1040 Washington Blvd. Stamford 06901 Oct. 30, 2024 Dec. 9, 2020 Platinum 7,889 Visitor and environmental education center 16 UConn Supplemental Utility Plant 2390 Alumni Drive Storrs 06269 (3) Oct. 17, 2024 Aug. 13, 2019 Gold 37,753 Higher education; utilities 17 Yale University 100 College St., Floors 2, 3, 10 New Haven 06510 Sept. 24, 2024 July 30, 2021 Gold 110,966 Higher education; core learning space 18 Fairfield University Bowman Hall 1073 North Benson Road Fairfield 06824 Aug. 1, 2024 July 26, 2022 Gold 46,184 Higher education; residence hall 19 Yale Peabody Museum of Natural History 170 Whitney Ave. New Haven 06520 July 29, 2024 April 3, 2018 Gold 141,000 Higher education; museum renovation 20 Wesleyan University Public Affairs Center 238 Church St. Middletown 06457 July 1, 2024 Feb. 6, 2019 Gold 74,666 Higher education; core learning and office space 21 Strawberry Hill School (4) 200 Strawberry Hill Ave. Stamford 06902 May 1, 2024 March 29, 2016 Gold 125,968 Primary education: renovation and new contruction 22 Apollo Global Management 100 West Putnam Ave. Greenwich 06830 March 26, 2024 Oct. 6, 2021 Silver 31,800 Office space renovation 23 Quinnipiac University Recreation and Wellness Center 275 Mount Carmel Ave. Hamden 06518 Feb. 13, 2024 Jan. 9, 2021 Gold 56,000 Higher education; new wellness and learning space 24 Yale University W-CSC ESC II - Phase 1 (5) 810 West Campus Drive New Haven 06516 Jan. 3, 2024 Oct. 14, 2014 Silver 24,359 Higher education; core learning space Source: U.S. Green Building Council as of Nov. 4, 2025, news reports and organization websites. Note: Excludes neighborhood development and single-family residential buildings. (1) Combined area for six buildings. (2) Combined area for two buildings. (3) Project is filed under UConn Foundation address. (4) An extension of the Rogers International Magnet School. (5) W-CSC ESC II is West campus Collections Studies Center, Energy Sciences Center II. -Compiled by Heide Martin, hmartin@nebusinessmedia.com LEED-CERTIFIED BUILDINGS IN CONNECTICUT Ranked by the most recently certified