/uh-MOR-tuh-ZAY-shun of non-kon-FOR-ming YOO-siz/·doctrine
Also known as:amortization of nonconforming use · amortize nonconforming uses · amortizing nonconforming uses · nonconforming use amortization
Written by attorneys · grounded in primary & secondary sources — see below
A zoning device by which an ordinance permits a nonconforming use to continue for a reasonable period before requiring its termination. Reasonableness turns on the nature of the use, the owner's investment, and the length of the period allowed. The device limits protection of pre-existing property rights and must not amount to a taking without just compensation.
Sources & Authorities· 1 primary source
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Common Law
Casebooks
Hornbooks
How it applies
Common Examples
2
Factory Amortization Challenge
Atlas Ventures has operated a metal fabrication plant for decades and recently installed heavy presses with a fifteen-year useful life. The city rezones the area residential and enacts an ordinance allowing existing factories to continue for only four years. Atlas sues, arguing the short period prevents recovery of its recent investment. A court will assess whether four years affords a reasonable opportunity to recoup costs given the scale of the outlay and the character of the industrial use.
Shipyard Phase-Out Dispute
Valley Maritime has run a ship repair yard for thirty-five years and holds long-term contracts extending past the rezoning date. After the city designates the waterfront for mixed-use development, an ordinance classifies the yard as nonconforming and sets a fifteen-year amortization period. Valley claims the specialized dry docks cannot be repurposed and that the period will destroy going-concern value. The court evaluates whether the fifteen-year window reasonably matches the remaining economic life of the facilities and permits orderly wind-down.
City of Los Angeles v. Gage127 Cal. App. 2d 442, 274 P.2d 34 (Cal. App. 2 Dist. 1954)
Common questions
Frequently Asked
4
What factors determine whether an amortization period is reasonable?+
Courts examine the nature and expected life of the use, the magnitude and recency of the owner's investment, the length of the phase-out period, and the degree of economic impact on the owner. An eight-year period for a mobile home park with substantial infrastructure may or may not suffice depending on evidence of useful life and financial effects.
When does an amortization ordinance effect an uncompensated taking?+
The ordinance effects a taking if the amortization period is unreasonably short in light of the owner's sunk investment and the character of the use, leaving no meaningful opportunity to recoup costs before the use must cease. A period that aligns with documented economic life and allows orderly transition is ordinarily upheld as a valid exercise of the police power.
Does tenant hardship affect the validity of an amortization scheme?+
Tenant reliance interests are relevant to the overall reasonableness inquiry but do not independently invalidate the ordinance. The constitutional focus remains on whether the period fairly accommodates the owner's investment-backed expectations in the nonconforming use itself.
What happens if the jurisdiction does not authorize amortization of nonconforming uses?+
Existing lawful uses receive vested protection and may continue indefinitely absent abandonment or other recognized grounds for termination. An ordinance attempting to force relocation after a fixed period will be unenforceable against the owner.
Real PropertyRights in real property · Zoning (fundamentals other than regulatory taking)UBEFoundational