New York Application Partial Tax Exemption For New Construction Or Substantial Rehabilitation is a program offered by the state of New York to provide partial tax exemptions to encourage and incentivize construction or substantial rehabilitation of residential or commercial properties. This exemption applies to the property's real estate taxes for a period of 12 years. There are three types of New York Application Partial Tax Exemption For New Construction Or Substantial Rehabilitation: 421-a Tax Exemption Program, Industrial and Commercial Abatement Program (ICAP), and Real Property Tax Law 485-b. The 421-a Tax Exemption Program provides property tax abatement for newly constructed or substantially rehabilitated residential properties. The ICAP program provides real estate tax abatement for newly constructed or substantially rehabilitated commercial or industrial properties. The Real Property Tax Law 485-b provides additional tax exemptions for certain types of residential properties.