In Perth Amboy, a Lot Can Meet Minimum Size and Still Need a Density Variance

One acre is 43,560 square feet. In Perth Amboy's R-25 zone the minimum lot is 2,500 square feet, so an acre divides into 17.424 legal lots. The city's Bulk Schedule caps the same zone at 12 dwelling units per acre. Divide land by the lot-size rule and you get one answer. Apply the density rule and you get a lower one. The difference is a public hearing that needs a supermajority vote.

That math is printed in the city's own draft 2026 Master Plan, dated May 13, 2026. The draft says the Zoning Board has reviewed subdivision and other applications in the R-60, R-50 and R-25 zones that met the minimum lot size but still required d(5) density variances, because the Bulk Schedule carries "a separate (and more stringent) density standard." For an investor pricing infill land or a small-multifamily site, that sentence matters more than any median on a portal. Today's code treats a lot that meets the minimum size as a lot that may still need a hearing.

The Arithmetic in the Bulk Schedule

The draft lays out the gap for single-family detached homes in a table. The figures below are the city's own:

The gap grows as lots get smaller. In R-60 the lot-size rule allows about 21% more units than the cap. In R-25 it allows about 45% more. R-25 is also the zone with the tightest lots, where infill math is most sensitive to unit count.

Here is a hypothetical parcel. A 10,000-square-foot R-25 site splits on paper into four 2,500-square-foot lots, and each one meets the minimum. Ten thousand square feet is about 0.23 acres. Spread the 12-unit cap across that area and you get roughly 2.75 units. The plan that conforms on lot size runs over on density, and the same site goes from a by-right filing to a variance hearing.

The city found this mismatch before 2026. The draft says the issue was taken up in a "Standards and Accessory Use Consistency Review" dated May 26, 2023, which was sent to the City Council for review and consideration. Three years later, the gap is back in a draft plan as a recommendation.

Five Votes Where a Permit Would Otherwise Do

A d(5) variance is defined by state law. New Jersey's Municipal Land Use Law, at N.J.S.A. 40:55D-70(d), lets a board grant a variance "in particular cases for special reasons" to permit, among other things, "an increase in the permitted density." The statute requires that a d variance "be granted only by affirmative vote of at least five members, in the case of a municipal board."

That vote threshold is the cost that rarely shows up in a pro forma. A project that conforms on lot size still needs a hearing, a record of special reasons and five yes votes. The calendar risk sits inside the land price whether or not the seller mentions it.

The same subsection carves out an exception to the density variance. The statutory text reads:

"except as applied to the required lot area for a lot or lots for detached one or two dwelling unit buildings, which lot or lots are either an isolated undersized lot or lots resulting from a minor subdivision"

Whether a particular parcel falls inside that language is a question for a New Jersey land-use attorney. Nothing in this post is legal, tax or financial advice. Confirm how the rules apply to your site with the right professional before you price it.

The Same Pattern in Storefront Buildings

The residential zones aren't the only place where the code allows less than the building type suggests. In the C-1 commercial zone, Perth Amboy's zoning code allows one- and two-family units only as accessory uses, and only under three conditions. Section 430-18B(1) requires:

"provided that these dwelling units do not occupy the first floor of any building, and that the area devoted to the use does not exceed forty-nine percent (49%) of the total building floor area and that the minimum floor area of each dwelling is not less than seven hundred (700) square feet, gross"

Picture a three-story commercial building with a store on the ground floor and apartments on the two floors above. Residential would take up about two-thirds of the floor area, well over the 49% ceiling. The building type most associated with a downtown corridor runs into a cap the code calls a density standard. The draft Master Plan says there is "no record within the City's Master Planning documents referencing this requirement as a density standard."

The code has changed since 2023. Its amendment history lists Ordinance 2183-2024, dated September 9, 2024, and Ordinance 2243-2025, dated June 11, 2025, among the amendments to these zoning sections. The C-1 text quoted above is still in the code. For a buyer, the codified text is the rule.

What the Draft Would Change

The draft's land use recommendations go at both frictions directly. Under its first goal, "Revitalize the City's Downtown Area," it recommends the following:

1. Amend the Zoning Ordinance to implement transit-oriented development around the Perth Amboy NJ Transit Station, including the creation of Downtown Transit Zones.
2. Revise C-1 zoning to support ground-floor residential, for example by clarifying that one- and two-family units are permitted as accessory uses if specific criteria are met.
3. Remove the 49% floor area cap on accessory residential uses in commercial zones.
4. Review off-street parking standards to allow parking relief near transit nodes.
5. Leave below-ground parking out of floor area ratio calculations to support higher density downtown and in transit-oriented areas.
6. Update zoning and redevelopment maps regularly and make them publicly accessible.

Under its third goal, "Foster an Affordable & Inclusive City," the draft adds infill development to diversify housing types, promotes accessory dwelling units in low-density residential zones, and calls for clarifying the density rules in R-60, R-50 and R-25.

The transit recommendation has the most specific geography. The draft quotes a 2013 study, the "Perth Amboy Bay City Transit District Strategy," which described the blocks between Market Street and New Brunswick Avenue, and between the NJ Transit tracks and Maple Street, as "a rare opportunity downtown: many vacant and city-owned parcels, and relatively few owners among the other parcels." That study is 13 years old, and the recommendation to zone for it is still a recommendation.

A Master Plan Doesn't Change the Zoning Code

This is where the timeline matters. Every page of the draft is stamped "DRAFT DOCUMENT – FOR DISCUSSION PURPOSES ONLY." The Planning Board noticed a public hearing for July 1, 2026, at 7 p.m. in the Council Chambers at City Hall, 260 High Street, to consider adopting the plan. The notice said the Board could act at the close of the hearing or continue it to another date. The city's Planning Board page still lists January 2003 as the last formal adoption of the Master Plan and describes the update as being in the draft stage and not yet adopted.

Adoption also wouldn't settle the issue. The city's own page says the older documents stay on record until a new plan is "formally adopted by the Planning Board and endorsed by the City Council," and the draft's first recommendation is itself a call to "amend the Zoning Ordinance." The plan sets the direction, and the ordinance text is what a buyer gets held to. The density mismatch shows how slow that second step can be. A 2023 review was forwarded to the Council, and the gap was still being recommended for a fix in 2026.

Underwriting the Code as Written

The gap between plan and ordinance has a price. A seller marketing a "subdividable" R-25 lot or a "mixed-use upside" C-1 building is often pricing the draft Master Plan. A buyer whose financing, construction schedule and rent roll depend on unit count has to price the code that applies today. That means the density cap, the 49% ceiling and the five-vote threshold for anything above them.

This is how we look at it on the Turnkey Tverdov side. A deal that only works with a variance carries two separate bets: the vote, and the months a hearing adds before construction can start. A deal that works at today's caps, with the draft's recommendations as possible upside if the ordinance is amended, carries neither. When asking prices assume a code change that hasn't happened, the buyer is the one paying for it.

FAQ

Is Perth Amboy's 2026 Master Plan in effect? Not as of the city's Planning Board page, which lists the January 2003 plan as the most recent one adopted and describes the update as a draft. An adoption hearing was noticed for July 1, 2026.

If the plan is adopted, do the density caps change? The draft recommends clarifying the R-60, R-50 and R-25 density rules through amendments to the Zoning Ordinance. The caps of 6, 7 and 12 units per acre are what the Bulk Schedule prints today.

Where is the C-1 49% cap written? In Section 430-18B(1) of the city's zoning code, which sets the conditions for one- and two-family units as accessory uses in the C-1 zone. A land-use professional can confirm how it applies to a specific property.

We underwrite small-multifamily and infill deals in Central New Jersey against the code as it reads today and treat proposed changes as upside. If you'd like that kind of underwriting on Perth Amboy acquisitions before they reach a contract, join the Turnkey Waitlist at Turnkey Tverdov.