Union County

Union County clears the first filter most New Jersey investors use: it's within the New York metro orbit, median home prices sit at $623,206, and median rent comes in at $2,511 a month. That produces a gross rent-to-price ratio of 0.0484, or roughly 48 cents of monthly rent per $1,000 of purchase price. To put that in context, a ratio of 0.083 (the "1% rule") is the threshold many cash-flow investors use, so Union is running at about 58% of that benchmark before a single expense hits the ledger. The cap rate on a model purchase works out to 3.14%, which is below what most lenders charge on the debt used to buy it, creating negative leverage by definition. The model cash-on-cash return at 6.85% financing is negative 13.69%, with estimated monthly cash flow of negative $1,635 after a 20% down payment. The appreciation score of 78 out of 100, combined with 2.85% year-over-year home price growth and a 34 affordability index, tells you what this market actually is: an appreciation play located in one of the more expensive corners of the country, not a yield machine.

The numbers above make the investor profile fairly narrow. A pure cash-flow buyer running a standard leveraged model here is going to bleed every month, and the 3.14% cap rate does not support all-cash acquisition at most return thresholds either. The investor Union County suits is one who wants long-term equity accumulation inside a high-demand, supply-constrained metro, is willing to accept negative carry in the near term, or can close the cash-flow gap through value-add execution, either by improving a below-market unit to push rents closer to or above the $2,511 county median, or by buying a multi-family at a discount to that median price and managing it tightly. The affordability index of 34 is a double-edged number: it reflects how expensive ownership has become, which pressures more households into renting, but it also signals that any further rate or price pressure could slow appreciation. The appreciation score of 78 is the single strongest argument for being here at all.

New Jersey as a whole runs a state-average effective property tax rate of 2.49% according to Tax Foundation 2024 data, and at that rate a $623,206 purchase generates $15,518 in annual property taxes alone, or roughly $1,293 a month. Add the modeled $109 monthly insurance figure and the combined tax-and-insurance line reaches $1,402 per month before mortgage, vacancy, maintenance, or management. That number deserves its own line on every underwrite, not a footnote. At 2.49%, the property tax rate is very high by national standards and is arguably the single largest structural drag on cash flow in this market. The state-average figure is the honest starting point, but county and township assessments in New Jersey are notoriously variable, so confirm the actual millage rate for any specific municipality before closing. Some Union County towns run above even this elevated state average.

Union County's primary risk is concentration of a single type. Nearly all the return thesis here rests on continued appreciation inside the New York commuter belt. If remote work permanently reduces the wage premium attached to metro proximity, or if New Jersey continues to lose net domestic population to lower-cost states, the appreciation engine slows while the negative carry remains. The affordability index of 34 already indicates most households are stretched; any material income shock or mortgage rate increase compresses the buyer pool that would eventually be your exit. There is no vacancy or regulatory data in the inputs to assess rent-control exposure, but investors should independently verify municipal rent-stabilization ordinances, which exist in several Union County municipalities and can cap rent-growth assumptions.

Against its neighbors, Union sits in the middle of the field. Bergen County prices out at $735,505 with a lower rent-to-price ratio of 0.0453 and the same overall score of 52, making Bergen a worse starting point on yield for a higher absolute check. Monmouth County carries a $733,160 median and a 0.0464 ratio, again worse on yield at a higher price. Morris County is the most interesting comparison: a $677,872 median, the best rent-to-price ratio in the peer group at 0.0502, and the highest overall score at 55, which means Morris produces marginally better relative yield at a meaningfully higher price than Union. Somerset County, at $640,205 and a 0.0497 ratio with an overall score of 53, is the closest competitor and edges Union on both yield and score at only a modest price premium. Passaic County is the cheapest entry point at $574,942 with a 0.0476 ratio, though its overall score of 51 trails most of the group. Choose Union over its neighbors when proximity to specific Union County employment centers or transit nodes justifies the lower relative yield, when you can identify assets trading at a meaningful discount to the $623,206 median where value-add execution can close the cash-flow gap, or when portfolio diversification across New Jersey submarkets is itself the goal. If pure yield optimization within this peer group is the objective, Morris or Somerset deserve a closer look first.