Energy audits can help calculate how efficiently your building is using energy

Multi-family building owners, developers, and landlords can get information from NYSERDA'S
New York Energy $mart(SM) for how to reduce residential energy expenditures: 

Existing Buildings:
http://www.getenergysmart.org/MultiFamilyHomes/ExistingBuilding/BuildingOwner.aspx

New Construction:
http://www.getenergysmart.org/MultiFamilyHomes/NewConstruction/BuildingOwner.aspx