By Eric Berman, REALTOR® | The Eric Berman Team at Compass
TL;DR:
An investment property is a spreadsheet that happens to have a roof. It gets bought on the numbers — the real ones, after the vacancy and the maintenance and the taxes come out — and on Long Island's tax base, the number that kills more deals than any other is the one for property taxes.
Buying a Business, Not a Home
The thing that separates a good investor from a burned one is that the good investor never falls in love with the house. The house is a delivery mechanism for a return, and the return either pencils or it doesn't, and no amount of liking the kitchen changes the math.
That sounds obvious and it's the most common mistake in the category. A buyer who tours a rental the way they'd tour a home — reacting to the finishes, imagining living there — is evaluating the wrong thing. The right evaluation is unromantic: what does this property produce in rent, what does it cost to own and operate honestly, what's left, and what return does that represent on the money going in. Everything else is noise.
Which means the diligence is financial before it's physical. The inspection still matters — this is Long Island 1950s housing stock and the systems and structural risks are the same as any other purchase — but it matters as an input to the number, not as a separate question. A great house with a bad cap rate is a bad investment. A plain house with a real return is the point.
The Numbers That Actually Matter
Investors talk in a few metrics, and each one answers a different question. Getting them right, on real inputs, is the whole job.
Cap rate — net operating income divided by price — is the property's unleveraged yield, and it's the cleanest way to compare two buildings. The trap is the word "net": the operating income has to be the real one, after every expense, not the seller's pro forma. Cash-on-cash return measures the actual cash the investor's actual dollars produce after financing, which is the number that matters to someone using a mortgage. Gross rent multiplier is a fast screen, not a decision. And the 1% guideline — monthly rent around one percent of price — is a rule of thumb that, on Long Island, is very hard to hit, because prices are high relative to rents here. An investor holding out for it in Nassau County will not buy anything.
Underneath all of them is the operating expense number, and this is where Long Island specifically punishes optimism. Property taxes here are among the highest in the country and they are the largest operating line by far — a figure that would be a rounding error in another state is the difference between positive and negative cash flow here. Add the honest lines investors skip: a vacancy allowance (even a strong rental market isn't a hundred percent occupied over ten years), maintenance and capital reserves on old housing stock, management whether hired or valued as the owner's own time, insurance, and turnover cost. A pro forma with no vacancy and no reserves is a wish, and the real number is always lower than the seller's.
Financing an Investment Is a Different Animal
The money is more expensive and the rules are stricter, and investors who assume owner-occupant terms get a surprise.
A non-owner-occupied investment property carries a higher interest rate and a larger down payment requirement — typically twenty to twenty-five percent minimum, often more — than the same buyer would face on a home they lived in. The rate premium and the down payment together change the cash-on-cash math materially, which is why the financing has to be modeled into the return rather than bolted on after. Lenders also underwrite the investor differently, looking at reserves and sometimes at the property's projected income, and the appraisal on an investment property can include a rent schedule.
Then there's the entity question, which is genuinely a question and genuinely not the agent's to answer. Whether to buy in a personal name or an LLC touches liability, financing (loans to entities work differently and sometimes cost more), taxes, and estate planning. It's a real decision with real trade-offs and it belongs to the investor's attorney and CPA, ideally before the offer, because changing it after contract is harder. The role here is flagging that the decision exists and needs those two people, not making it.
The Tax Layer Nobody Should Wing
Investment real estate has a tax treatment that's a real part of the return, and it's the part where an agent's job is to point at the right professional and stop.
The concepts are worth knowing exist. Depreciation lets an investor deduct the building's value over time, which shelters income and is a meaningful piece of the after-tax return. A 1031 exchange lets an investor defer capital gains by rolling proceeds from one investment property into another, on a strict timeline with strict rules — miss the deadline and the deferral is gone. Deductible expenses, passive activity rules, and the treatment of improvements versus repairs all move the actual return.
Every one of those is a CPA's calculation, not an agent's, and the good decisions happen before the purchase, not at tax time. An investor planning a 1031 in particular has to have the structure set up before the first sale closes, because the timeline starts at that closing and the rules don't bend. The service here is making sure that conversation happens early enough to matter — not running the numbers, which is someone else's licensed work.
What This Service Covers
The search is scoped to the investment thesis rather than to houses — cash flow, appreciation, or a blend, and single-family rental versus small multi-family, which are different strategies with different math. For the two-to-four-unit owner-occupant path specifically, the multi-family buyer work goes deeper on the house-hacking and rent-roll-verification side.
The core is the underwriting. Cap rate, cash-on-cash, and gross rent multiplier run on verified inputs rather than the seller's pro forma — rents confirmed against leases, bank deposits, and Schedule E where units are tenanted, and the operating expenses built with the lines sellers omit: real Long Island property taxes, a vacancy allowance, maintenance and capital reserves, and management valued honestly. A cash flow read that survives contact with reality, financing modeled in at investor terms, and a plain answer on whether the deal actually returns what the investor needs.
Around that: lender referrals who write investment property and can speak to reserves and rental-income qualification before the file goes in. Early attorney and CPA engagement on the entity structure and any 1031 timing, because both have to be set before the purchase. Property management referrals with an honest read on whether the fee is worth it. And offer and diligence structure that gives the numbers room to be verified before the investor is committed.
Tenant screening, lease terms, and landlord-tenant compliance go to the attorney and the property manager. That's not a dodge — under New York's tenant framework it's genuinely their work, and an agent freelancing on it creates exposure for the investor.
How This Usually Plays Out
The most common version on Long Island: a first-time investor with a seller's pro forma showing a seven percent cap rate and a clean positive cash flow. Rebuilt on real numbers, it falls apart in a predictable place — the pro forma used the seller's owner-occupied property tax figure, and a non-owner-occupied purchase plus a Nassau reassessment pushes the tax line up by several thousand a year. Add a vacancy allowance and a reserve line the seller left out, and the seven percent cap is closer to four and a half, and the cash flow is roughly break-even. That's not necessarily a bad buy — but it's a completely different buy than the one on the seller's sheet, and the investor should know which one they're making.
The other one is the 1031 that wasn't set up. An investor sells a property expecting to roll the gain into the next one, but the exchange structure wasn't in place before the first closing, and the timeline and the intermediary requirements can't be retrofitted after the fact. The deferral is lost, the gain is taxable, and it was entirely preventable with a CPA conversation that needed to happen weeks earlier. Nothing about the real estate was wrong. The sequencing was.
FAQs
What makes a good investment property on Long Island?
The numbers, run honestly — cap rate and cash-on-cash on real operating expenses, not the seller's pro forma. The specific Long Island challenge is property taxes, which are among the highest in the country and the largest operating line, capable of turning an apparently positive deal negative. A great-looking house with a bad return is a bad investment.
What's a realistic cap rate here?
Lower than investors coming from other markets expect, because Long Island prices are high relative to rents. The 1% rule — monthly rent near one percent of price — is very hard to hit in Nassau County, and an investor holding out for it won't buy. What matters is a real cap rate on verified numbers, compared against the investor's actual required return, rather than a benchmark from a cheaper market.
How is financing different for an investment property?
More expensive and stricter. A non-owner-occupied property typically requires twenty to twenty-five percent down or more and carries a higher rate, both of which change the cash-on-cash math and have to be modeled into the return upfront. Lenders also scrutinize reserves and may weigh projected rental income, and buying through an entity changes the financing again.
Should an investor buy through an LLC?
That's a real question with liability, tax, financing, and estate-planning dimensions, and it belongs with the investor's attorney and CPA rather than an agent. It's worth deciding before the offer, since changing it after contract is harder, and loans to entities can carry different terms. The role here is making sure the question gets asked of the right people early.
What tax benefits come with investment property?
Depreciation shelters income over time, and a 1031 exchange can defer capital gains by rolling proceeds into another investment property on a strict timeline. Both are meaningful parts of the return and both are a CPA's work, not an agent's. A 1031 in particular has to be structured before the first sale closes, which is why the conversation belongs early.
The Deal Is the Numbers
An investment purchase is won or lost in the underwriting, and the underwriting is won or lost on whether the inputs are real. The seller's pro forma is a marketing document; the property taxes are a fact; and on Long Island the gap between those two is where the return quietly disappears.
For investors ready to see what's on the market, the search portal is the place to start. The conversation about whether a specific deal actually pencils — on real numbers, with the CPA and the attorney in early — is welcome whenever it's useful.
By Eric Berman, REALTOR® | The Eric Berman Team at Compass
Eric Berman | Long Island & Queens REALTOR® | Compass
1468 Northern Blvd, Manhasset, NY 11030
(917) 225-8596 | eric@ericbermanteam.com | theericbermanteam.com
