N.Y. Real Property Tax Law Section 421-P*2
Exemption of capital improvements to residential new construction involving the creation of accessory dwelling units

* § 421-p. Exemption of capital improvements to residential new construction involving the creation of accessory dwelling units.

1.

Residential buildings reconstructed, altered, improved, or newly constructed in order to create one or more additional residential dwelling units on the same parcel as a pre-existing residential building to provide independent living facilities for one or more persons subsequent to the effective date of a local law or resolution enacted pursuant to this section shall be exempt from taxation and special ad valorem levies to the extent provided hereinafter. After a public hearing, the governing board of a county, city, town or village may adopt a local law and a school district, other than a school district subject to article fifty-two of the education law, may adopt a resolution to grant the exemption authorized pursuant to this section. A copy of such local law or resolution shall be filed with the commissioner and the assessor of such county, city, town or village who prepares the assessment roll on which the taxes of such county, city, town, village or school district are levied.

2.

(a) Such buildings shall be exempt for a period of five years to the extent of one hundred per centum of the increase in assessed value thereof attributable to such reconstruction, alteration, improvement, or new construction for such additional residential unit or units that provide independent living facilities for one or more persons, and for an additional period of five years subject to the following:

(i)

The extent of such exemption shall be decreased by twenty-five per centum of the “exemption base” for each of the first three years during such additional period and shall be decreased by a further ten per centum of the “exemption base” during each of the final two years of such additional period. The exemption shall expire at the end of the extended period. The “exemption base” shall be the increase in assessed value as determined in the initial year of the term of the exemption, except as provided in subparagraph (ii) of this paragraph.

(ii)

In any year in which a change in level of assessment of fifteen percent or more is certified for a final assessment roll pursuant to the rules of the commissioner, the exemption base shall be multiplied by a fraction, the numerator of which shall be the total assessed value of the parcel on such final assessment roll (after accounting for any physical or quantity changes to the parcel since the immediately preceding assessment roll), and the denominator of which shall be the total assessed value of the parcel on the immediately preceding final assessment roll. The result shall be the new exemption base. The exemption shall thereupon be recomputed to take into account the new exemption base, notwithstanding the fact that the assessor receives certification of the change in level of assessment after the completion, verification and filing of the final assessment roll. In the event the assessor does not have custody of the roll when such certification is received, the assessor shall certify the recomputed exemption to the local officers having custody and control of the roll, and such local officers are hereby directed and authorized to enter the recomputed exemption certified by the assessor on the roll. The assessor shall give written notice of such recomputed exemption to the property owner, who may, if such property owner believes that the exemption was recomputed incorrectly, apply for a correction in the manner provided by title three of article 5 (Assessment Procedure)article five of this chapter for the correction of clerical errors.

(iii)

Such exemption shall be limited to two hundred thousand dollars in increased market value of the property attributable to such reconstruction, alteration, improvement, or new construction and any increase in market value greater than such amount shall not be eligible for the exemption pursuant to this section. For the purposes of this section, the market value of the reconstruction, alteration, improvement, or new construction as authorized by subdivision one of this section shall be equal to the increased assessed value attributable to such reconstruction, alteration, improvement, or new construction divided by the class one ratio in a special assessing unit or the most recently established state equalization rate or special equalization rate in the remainder of the state, except where the state equalization rate or special equalization rate equals or exceeds ninety-five percent, in which case the increase in assessed value attributable to such reconstruction, alteration, improvement, or new construction shall be deemed to equal the market value of such reconstruction, alteration, improvement, or new construction.

(b)

No such exemption shall be granted for reconstruction, alterations, improvements, or new construction unless:

(i)

such reconstruction, alteration, improvement, or new construction was commenced subsequent to the effective date of the local law or resolution adopted pursuant to subdivision one of this section; and

(ii)

the value of such reconstruction, alteration, improvement, or new construction exceeds three thousand dollars; and

(iii)

such reconstruction, alteration, improvement, or new construction created one or more additional residential dwelling units on the same parcel as the pre-existing residential building to provide independent living facilities for one or more persons.

(c)

For purposes of this section the terms reconstruction, alteration, improvement, and new construction shall not include ordinary maintenance and repairs.

3.

Such exemption shall be granted only upon application by the owner of such building on a form prescribed by the commissioner. The application shall be filed with the assessor of the city, town, village or county having the power to assess property for taxation on or before the appropriate taxable status date of such city, town, village or county.

4.

If satisfied that the applicant is entitled to an exemption pursuant to this section, the assessor shall approve the application and such building shall thereafter be exempt from taxation and special ad valorem levies as herein provided commencing with the assessment roll prepared on the basis of the taxable status date referred to in subdivision three of this section. The assessed value of any exemption granted pursuant to this section shall be entered by the assessor on the assessment roll with the taxable property, with the amount of the exemption shown in a separate column.

5.

For the purposes of this section, a residential building shall mean any building or structure designed and occupied exclusively for residential purposes by not more than two families.

6.

In the event that a building granted an exemption pursuant to this section ceases to be used primarily for residential purposes, or title thereto is transferred to other than the heirs or distributees of the owner, the exemption granted pursuant to this section shall cease.

7.

(a) A county, city, town or village may, by its local law, or school district, by its resolution:

(i)

reduce the per centum of exemption otherwise allowed pursuant to this section; and

(ii)

limit eligibility for the exemption to those forms of reconstruction, alterations, improvements, or new construction as are prescribed in such local law or resolution.

(b)

No such local law or resolution shall repeal an exemption granted pursuant to this section until the expiration of the period for which such exemption was granted. * NB There are two § 421-p’s

Source: Section 421-P*2 — Exemption of capital improvements to residential new construction involving the creation of accessory dwelling units, https://www.­nysenate.­gov/legislation/laws/RPT/421-P*2 (updated May 3, 2024; accessed Oct. 26, 2024).

420‑A
Nonprofit organizations 420‑B
Nonprofit organizations 420‑C
Exemption from local real property taxation of certain low income housing accommodations in a city having a population of one million or ... 421‑A
Affordable New York Housing Program 421‑B
Exemption of certain private dwellings, multiple dwellings and improvements from local taxation 421‑C
Exemption of certain new multiple dwellings from local taxation 421‑D
Exemption of multiple dwellings financed by the New York state housing finance agency from local taxation 421‑E
Exemption of cooperative, condominium, homesteading and rental projects from local taxation 421‑F
Exemption of capital improvements to residential buildings and certain new construction 421‑FF
Exemption of capital improvements to residential buildings in cities with a population between twenty-seven thousand five hundred and twe... 421‑G
Exemption from local taxation of certain multiple dwellings 421‑H
Exemption of capital improvements to multiple dwelling buildings within certain cities 421‑H*2
Exemption of capital improvements to residential buildings 421‑I
Exemption of capital improvements to multiple dwelling buildings within certain cities 421‑I*2
Exemption of capital improvements to multiple dwelling buildings within certain cities 421‑J
Exemption of capital investment in multiple dwelling buildings within certain cities 421‑J*2
Exemption of capital improvements to multiple dwelling buildings within certain cities 421‑K
Exemption of certain multiple dwellings 421‑L
Exemption of capital improvements to residential buildings in certain towns 421‑M
Exemption of certain new or substantially rehabilitated multiple dwellings from local taxation 421‑N
Exemption of capital improvements to multiple dwelling buildings within certain cities 421‑O
Exemption of capital improvements to multiple dwelling buildings within certain cities 421‑O*2
Exemption of capital improvements to multiple dwelling buildings within certain cities 421‑P
Exemption of newly-constructed or converted rental multiple dwellings 421‑P*2
Exemption of capital improvements to residential new construction involving the creation of accessory dwelling units 422
Not-for-profit housing companies 423
Phase out of exemption for redevelopment company projects upon the cessation of the tax exemption granted pursuant to contract 424
Institute of arts and sciences 425
School tax relief (STAR) exemption 425‑A
Abatement of county taxes in special assessing units 426
Opera houses 427
Performing arts buildings 428
Fraternal organizations 429
Real property used for professional major league sports 430
Interdenominational centers 432
Theatrical corporations created by act of congress 434
Academies of music 436
Officers of religious denominations 438
Trustees of a hospital, playground and library 440
Infant homes 442
Soldiers monument corporations 444
Historical societies 444‑A
Historic property 446
Cemeteries 450
Agricultural societies 452
Veterans organizations 454
Indians 455
Exemption option 456
Municipal railroads 457
Exemption for first-time homebuyers of newly constructed homes 458
Veterans 458‑A
Veterans 458‑B
Exemption for Cold War veterans 458‑C
Improvements to property of severely injured members of the armed forces of the United States 459
Persons who are physically disabled 459‑A
Improvements to property made pursuant to the Americans with Disabilities Act of 1990 459‑B
Physically disabled crime victims 459‑C
Persons with disabilities and limited incomes 460
Clergy 462
Religious corporations 464
Incorporated associations of volunteer firefighters 466
Volunteer firefighters and fire companies in villages 466‑A
Volunteer firefighters and volunteer ambulance workers 466‑A*2
Volunteer firefighters and volunteer ambulance workers 466‑B
Volunteer firefighters and volunteer ambulance workers 466‑C
Volunteer firefighters and volunteer ambulance workers 466‑C*2
Volunteer firefighters and volunteer ambulance workers 466‑C*3
Volunteer firefighters and volunteer ambulance workers 466‑C*4
Volunteer firefighters and volunteer ambulance workers 466‑C*5
Volunteer firefighters and volunteer ambulance workers 466‑C*6
Volunteer firefighters and volunteer ambulance workers 466‑C*7
Volunteer firefighters and volunteer ambulance workers 466‑D
Volunteer firefighters and volunteer ambulance workers 466‑D*2
Volunteer firefighters and volunteer ambulance workers 466‑D*3
Volunteer firefighters and volunteer ambulance workers 466‑D*4
Volunteer firefighters and volunteer ambulance workers 466‑E
Volunteer firefighters and volunteer ambulance workers 466‑E*2
Volunteer firefighters and volunteer ambulance workers 466‑E*3
Volunteer firefighters and volunteer ambulance workers 466‑E*4
Volunteer firefighters and volunteer ambulance workers 466‑F
Volunteer firefighters and volunteer ambulance workers 466‑F*2
Volunteer firefighters and volunteer ambulance workers 466‑F*3
Volunteer firefighters and volunteer ambulance workers 466‑F*4
Volunteer firefighters and volunteer ambulance workers 466‑F*5
Un-remarried spouses of volunteer firefighters or volunteer ambulance workers killed in the line of duty 466‑G
Volunteer firefighters and volunteer ambulance workers 466‑G*2
Volunteer firefighters and volunteer ambulance workers 466‑H
Volunteer firefighters and volunteer ambulance workers 466‑H*2
Un-remarried spouses of deceased volunteer firefighters or volunteer ambulance workers 466‑I
Volunteer firefighters and volunteer ambulance workers 466‑J
Volunteer firefighters and volunteer ambulance workers 466‑K
Volunteer firefighters and volunteer ambulance workers 466‑L
Extension of benefits 467
Persons sixty-five years of age or over 467‑A
Partial tax abatement for residential real property held in the cooperative or condominium form of ownership in a city having a populatio... 467‑B
Tax abatement for rent-controlled and rent regulated property occupied by senior citizens or persons with disabilities 467‑C
Exemption for property owned by certain housing companies or sublessees of the battery park city authority and occupied by senior citizen... 467‑D
Assessment exemption for certain living quarters constructed to be occupied by a senior citizen or disabled individual 467‑E
Rebate for owners or tenant-stockholders of one, two or three family residences or residential property held in the condominium or cooper... 467‑F
Protective and safety devices tax abatement 467‑G
Rebate for owners of certain real property seriously damaged by the severe storm that occurred on the twenty-ninth and thirtieth of Octob... 467‑H
Partial abatement for certain rebuilt real property seriously damaged by the severe storm that occurred on the twenty-ninth and thirtieth... 467‑I
Real property tax abatement 467‑J
Exemption for certain residential properties located in certain counties 467‑K
Senior citizen longtime resident exemption 467‑K*2
Exemption for certain residential property required to participate in the federal flood insurance program 467‑L
Rebate for owners of certain real property in the city of New York 467‑M
Exemption from local real property taxation of certain multiple dwellings in a city having a population of one million or more 468
Fire patrol and salvage corps 469
Assessment exemption for living quarters for parent or grandparent 470
Exemption for improvements to real property meeting certification standards for green buildings 472
Pharmaceutical societies 474
Dental societies 476‑A
Railroad passenger stations 477
Tax exemption for industrial waste treatment facilities 477‑A
Tax exemption for air pollution control facilities 478
Tax exemption for off-street parking facilities providing underground shelters 479
Fallout shelter facilities 480
Forest and reforested lands 480‑A
Taxation of forest land 481
Taxation of land used for agricultural production 482
Quarantined lands 483
Exemption from taxation of structures and buildings essential to the operation of agricultural and horticultural lands 483‑A
Farm silos, farm feed grain storage bins, commodity sheds, bulk milk tanks and coolers, and manure storage and handling facilities 483‑B
Historic barns 483‑C
Temporary greenhouses 483‑D
Farm or food processing labor camps or commissaries 483‑E
Anaerobic digestion facilities 484
Urban redevelopment corporations and companies 485
Nuclear powered electric generating facilities 485‑A
Residential-commercial urban exemption program 485‑B
Business investment exemption 485‑C
Exemption from taxation of real property used in manufacture of steel in cities of fifty thousand or more persons 485‑D
Water-works corporations 485‑E
Empire zone exemption 485‑F
Banking development districts 485‑G
Infrastructure exemption 485‑H
Residential investment exemption 485‑I
Residential investment exemption 485‑I*2
Residential investment exemption 485‑J
Residential property improvement exemption 485‑J*2
Residential investment exemption 485‑J*3
Residential investment exemption 485‑J*4
Residential investment exemption 485‑J*5
Residential investment exemption 485‑K
Residential investment exemption 485‑L
Residential property improvement 485‑L*2
Residential investment exemption 485‑M
Residential investment exemption 485‑N
Residential-commercial exemption program 485‑O
New residential property exemption 485‑P
Economic transformation area exemption 485‑Q
Residential investment exemption 485‑R
Residential redevelopment inhibited property exemption 485‑S
Residential reassessment exemption 485‑S*2
Residential reassessment exemption 485‑S*3
Mixed use exemption program for villages 485‑T
Owner occupied residential property exemption program 485‑U
Class one reassessment exemption 485‑V
Residential revaluation exemption 485‑V*2
Residential and mixed-use investment exemption 485‑W
Newly constructed single-family and multi-family residential exemption 485‑X
Affordable neighborhoods for New Yorkers tax incentive 486
Non-profit medical and dental indemnity, or hospital service corporations 486‑A
Non-profit corporations operating as health maintenance organizations 487
Exemption from taxation for certain energy systems 487‑A
Exemption from taxation of conservation improvements to certain residential premises 488
Retirement systems 488‑A
Rehabilitation of certain class B multiple dwellings and class A multiple dwellings used for single room occupancy 489
Exemption from taxation of alterations and improvements to multiple dwellings to eliminate fire and health hazards
Green check means up to date. Up to date

Accessed:
Oct. 26, 2024

Last modified:
May 3, 2024

§ 421-P*2’s source at nysenate​.gov

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