770 11th Avenue 10-20

770 11th Avenue Mixed Use Development Rezoning EIS

770 11th Avenue 10-20Two Trees Management Corp., proposed a 1.3 million gsf mixed use development on 11th Avenue in Manhattan that would include 900 dwelling units, retail uses, a health club, an auto sales and repair facility, 225 accessory parking spaces, and 28,000 gsf of stables for the NYPD Mounted Unit. As a subconsultant to Philip Habib & Associate, SEA carried out air quality and noise studies. The building would be 32 stories high, and had a stepped design that was challenging to model.


Air Quality

  • Traffic air quality modeling with CAL3QHC
  • Parking deck and garage air quality using CEQR Technical Manual
  • AERMOD modeling of:
    • NOx from PTAC units
    • NO2¬†and PM2.5 from nearby HVAC
    • Boilers planned for common areas
    • Boilers planned for commercial floor space
    • Odors (ammonia) from planned horse stables
  • Air toxics analysis using Industrial Source Screen


  • Noise monitoring and vehicular classification counts for peak AM, Midday, and PM traffic periods
  • Traffic noise using passenger car equivalents (PCEs)
  • Equipment noise from:
    • Chillers for auto dealership planned for site
    • Chillers on roof of AT&T building across from site
  • Recommendations for:
    • Window attenuation specifications for residents
    • Cooling tower specifications for auto dealership

This is one of many projects carried out for major EISs. Similar projects include Astoria Cove EIS, Port Morris Rezoning EIS, Crotona Park/West Farms Rezoning EIS, and Chappaqua Crossing EIS.


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