S.7000-A is the name given to the current dominant property tax law in effect in New York State affecting New York City. Surrounding areas such as Nassau County have similar laws. The bill was enacted in 1981 in response to the Hellerstein decision (Hellerstein v. Assessor of Islip, 37 N.Y.2d 1 (1975)). The law is embodied in Article 18 of the New York State Real Property Law.
The most significant portions of the law are the creation of tax classes, the limitation on assessment increases for small homes (1 to 3 family homes called Class 1) and for other residential property with 10 units or less (a subset of Class 2), the setting of an upper limit for the "assessed value" as a percentage of "market value" across the different tax classes, and the limitation on the increase allowed in the allocation of the tax levy across the different tax classes from the previous year's assessment roll.
S.7000-A was a reaction to the Hellerstein decision (Hellerstein v. Assessor of Islip, 37 N.Y.2d 1 (1975)). There was discussion of a 100% re-assessment of all properties in New York State. A group called State Coalition Against 100% Re-Assessment (SCAR) fought for 5 years to stop 100% re-assessment of properties and eventually helped enact S.7000-A
There was much debate before S.7000-A was enacted. These are some of the quotes:
"The Hellerstein decision has thrown into complete chaos the entire basis on which New York City and New York State always raised tax revenue,” said Assemblyman Brian Sharoff, Brooklyn Democrat in 1976. Brian Sharoff was chairman of the State Assembly Committee on Real Property Taxation at the time.
“It has threatened directly the middle‐class taxpayer with the possibility of increases of two or three times in taxes. There would be substantial dislocations in urban areas.”
Before the S.7000-A law was passed, New York State assessors typically used fractional assessments. Usually, properties were assessed when they were built and never reassessed. Over 100 years or more, this caused large discrepancies between older buildings assessed values and newer construction assessed values.
Assessment system found unconstitutionalEdit
In order to bring the assessment law in compliance with the New York State Constitution, the New York State leadership proposed to set up two systems, one for New York City and Nassau County and one for the rest of the state.
Key components of the lawEdit
The key terms to understand in property tax law are "market value" and "assessed value". The property tax amount is a percentage of the property's assessed value. Sometimes, the assessed value and the market value are set by law to be the same value. When the assessed value is a percentage of the market value, this is called "fractional assessment". Market value is usually the amount for which the property can be sold in an arms length transaction. However, in New York State for only apartment houses, including cooperatives and condominiums the market value is not the amount for which the property can be sold. Instead, the market value is calculated by the New York City Department of Finance using a statistical model.
Setting the assessed value of a propertyEdit
The assessed value of a property is calculated based on the property's "market value", an assessment ratio set annually by the New York City Department of Finance and the Nassau County Assessor, and certain assessment rules set by state law. New York City and Nassau County are legally obligated by RPTL section 738 and N.Y.C. Admin. Code § 11-212, among other provisions, to adjust the assessment ratio or level of assessment within each class to reflect the market, and to ensure that assessments are uniform within each tax class and that the resulting taxes are equalized.
New York City Department of Finance has lowered the assessment ratio in the past to comply with the law's uniformity requirement. After the State Legislature enacted the current system in response to Hellerstein, the Class One assessment ratio was about 25%. It was lowered to 18% in 1985, and then to 12% in 1989. In 1992, the ratio was lowered to 8%, and then in 2004 to the current 6% ratio.
Setting the tax rateEdit
Historical charts showing the effect of New York State Tax Law S7000A on property tax growth.
This is the link to the sheet that creates the charts.
The New York City Independent Budget Office estimates a $4.5 billion budget gap in 2022. 
A property tax lawsuit was filed on April 25, 2017 against New York City and New York State by Tax Equity Now New York, a group that includes Jonathan Lippman, the law firm of Latham and Watkins representing homeowners, tenants, and other interested parties and groups.
On September 29, 2017 a group of New York City council members filed an amicus curiae brief in support of the Tax Equity Now New York lawsuit and the New York City Mayor argued that the case should be dismissed.
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- "Preservation of Class Share of Taxes In Municipal Corporations Except Counties Within a City, Included Within the Boundaries of a Special Assessing Unit and Limitation On Increases In Assessments Therein". NY State Senate. 2018-11-10. Retrieved 2018-11-14.
- Lowenstein, Robbie (2006-12-05). "Twenty-Five Years After S7000A: How Property Tax Burdens Have Shifted in New York City" (PDF).
- "One of the most important things that your Civic Association has done for you". bowneparkcivic.com. Retrieved 2018-11-15.
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- "Hellerstein v. Assessor, Islip". 1975-06-05. p. 1. Retrieved 2019-01-21.
- Dionne, E. J., Jr (1979-03-30). "Albany Panel Urges the Assessing Of All Property at Full Valuation". The New York Times. ISSN 0362-4331. Retrieved 2018-12-14.
- Herman, Robin (1981-11-12). "Carey Vetoes a Key Bill Revising State's Illegal Property Tax System". The New York Times. ISSN 0362-4331. Retrieved 2018-12-14.
- Dionne, E. J., Jr (1981-12-04). "Legislature Overrides Carey; Property Tax Bill Is Now Law". The New York Times. ISSN 0362-4331. Retrieved 2018-12-14.
- "NYC Property Tax Guide for Class 2 Properties" (PDF).
- "Residential assessment ratio". NY State Senate. 2018-11-10. Retrieved 2018-11-15.
- Tax Equity Now NY LLC, Plaintiff, -against- City of New York; New York City Department of Finance; State of New York; and New York Office of Real Property Tax Services
- Tax Equity Now Ny Llc v. City of New York, 2018, September 24, 2018, p. 32378, retrieved 2018-11-15
- "Judge Deals Blow to Council in Fight With Mayor Over Powers". The New York Times. Retrieved 2018-11-15.
- Goodman, J. David (2017-11-15). "In Court, Mayor and City Council Wrangle Over Powers". The New York Times. ISSN 0362-4331. Retrieved 2019-01-12.
- Siegel, William B.; David, Donald (June 1982). "A Real Property Tax Bouillabaisse: S. 7000A, Slewett & Farber and Colt". New York State Bar Journal. 54 (4): 230–233, 239.