At a Borough Council meeting in January, Allendale officials explained on the record why a court had ordered the borough to sign the approval that lets a 275-unit apartment complex across its town line in Saddle River send its wastewater through Allendale's sewer system.
That sequence points to something buyers comparing Allendale and Saddle River can use before they start counting bedrooms. On this shared border, the sewer agreement between the two boroughs shapes how much new housing gets built alongside each town's zoning map.
The quota Allendale met without pouring a foundation
New Jersey's Fourth Round affordable housing cycle required Allendale, like every municipality in the state, to account for its fair share of low and moderate income housing. The borough introduced ordinances in February 2026 to amend its master plan and expand its housing overlay zone, and by April 2026 its own Land Use Board was reporting that the fourth round obligation had already been met. What the plan does not include is much new construction.
Instead, Allendale is leaning on a mechanism most homeowners never think about until it applies to them directly: the Affordable Ownership Unit Extension Program. Most of the borough's existing affordable ownership units were sold to their original certified buyers starting around 2002, each with a 30-year affordability control period attached to the deed. As those 30-year windows started closing, Allendale chose to extend them to 60 years rather than let the units exit the program. The borough's own housing page is explicit that this extension does not require the current owner's signature. It happens by municipal resolution, filed with the New Jersey Housing and Mortgage Finance Agency, and recorded against the property with the Bergen County Clerk.
That is a legitimate, state-sanctioned tool. It is also, in practical terms, how Allendale satisfied a chunk of its fourth round obligation without a single new unit going up: by keeping units that were already affordable, affordable for another three decades.
If you are looking at one of these units as a resale opportunity, the math changed under you. A 60-year control period means the restricted resale price formula, which Allendale's Housing Element and Fair Share Plan ties to regional median income for Bergen, Hudson, Passaic and Sussex counties, stays in place well past the horizon most buyers plan around. It is worth checking the recording date and control period on any Allendale affordable unit before assuming when it converts to a market-rate sale.
The real gate is a sewer pipe, not a zoning line
Allendale's restraint on its own soil has not stopped growth from arriving at its doorstep. Right on the border, in Saddle River, AvalonBay's 275-unit development moved forward with Saddle River's approval. The complication is that Saddle River's own sewer infrastructure could not support it. Allendale council members described the situation plainly in their January 15 meeting minutes: Saddle River was approving large residential projects on land that, by Allendale's read, lacked the physical treatment capacity to handle them.
Saddle River asked to route the project's wastewater through Allendale's system. Allendale refused. A Superior Court judge then ordered Allendale to sign a Treatment Works Approval, the state environmental permit that authorizes a sewer connection, allowing the Avalon Bay project to proceed through Allendale's plant. Allendale appealed. At one point the developer threatened a $100 million lawsuit against Saddle River over the delay, then dropped it. Saddle River formally executed the sewer agreement on April 20, 2026, following its own resolution earlier that month.
Here is the part that matters if you are trying to figure out what actually governs growth on this border:
| What buyers usually check | What actually decided this |
|---|---|
| Allendale's zoning map | A court-ordered sewer agreement between two boroughs |
| Allendale's Fourth Round housing plan | Whether existing deed restrictions could simply be extended instead of building new |
| Saddle River's own approvals | Whether Saddle River had the treatment capacity to support what it approved |
Allendale council members were also careful to draw a line that has nothing to do with zoning and everything to do with money. They refused to negotiate directly with the developer at any point, insisting the agreement stay strictly between the two municipalities, and they built in a flow-based charge so Allendale gets compensated for every gallon that crosses the line, plus an administrative fee to cover legal and engineering time. The agreement allocates costs by measured flow and stays between the two boroughs, which gives buyers a concrete document to look for when they want to know what can be built on either side of the line.
The friction didn't end with the signature
Signing the Treatment Works Approval did not close the file. In the months after, Allendale's Land Use Board was still negotiating a related liner project meant to fix inflow and infiltration problems in the shared sewer line, and the two boroughs went back and forth over how to split a $500,000 payment tied to that work. Allendale held the line that the arrangement stayed strictly between the two municipalities, with Avalon Bay kept out of the financial side of it entirely. By late July, Allendale's council was still working through sewer business on this same corridor, holding a special meeting that covered further Treatment Works Approval certifications alongside a rehabilitation project on Allendale Avenue itself.
None of that shows up on a zoning map. It shows up in a stack of resolutions and engineering line items that keep getting renegotiated months after the headline agreement was signed.
Allendale has also pushed back at the state level on a separate bill, S-4736, that would let religious institutions and nonprofits rezone for up to 50 units per acre near transit without going through local zoning approval, and would permit accessory dwelling units as of right. It fits the same pattern the council keeps describing out loud: state and neighboring-municipality housing mechanisms moving on a timeline that doesn't wait for Allendale's own zoning code to catch up.
What this means if you are comparing these two towns
If you are weighing Allendale against Saddle River, the town's own master plan and current zoning ordinance will tell you what is allowed today. They will not tell you what is actually coming. That answer sits in Superior Court filings, Treatment Works Approval applications, and inter-municipal sewer agreements, documents that rarely show up in a standard property search but that determine, gallon by gallon, how much new housing a border town like this can actually absorb.
For a buyer looking specifically at Allendale, the practical takeaway is that the borough's own housing stock is not expanding through new construction right now. Its fourth round compliance ran through deed extensions on existing units, not new supply. For a buyer looking at Saddle River addresses near the Allendale line, the practical takeaway is that an executed, dated sewer agreement on file with both boroughs is a very different level of certainty than a zoning approval standing on its own. The Avalon Bay project has that document. Anything else proposed along this same border will need one too, and getting it out of Allendale has already taken a court order once.
Either way, the documents worth reading before an offer are not the ones most buyers pull first.
A few straight answers
Does extending an affordable unit's deed restriction change what the home is worth? It changes the resale price formula's timeline, not the physical home. The unit still sells at a price indexed to regional median income rather than market rate, just for 30 additional years.
Does the Avalon Bay project change Allendale's own zoning? No. Allendale has been explicit that its sewer agreement is limited to treatment capacity and does not constitute approval of any subdivision, site plan, or other development application on its side of the line.
Where can I check the status of these agreements myself? Both boroughs post primary documents on their municipal websites. Allendale's fair share housing page and meeting minutes, and Saddle River's own 2026 Affordable Housing page, include the resolutions and executed agreements referenced here.
Border development like this rarely gets simpler once it starts. If you are weighing a purchase near this line and want a read on what is actually moving through the pipeline before you write an offer, The Doyle Group can help you look past the zoning map to the agreements that are actually deciding what gets built.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
