A comparable set is what tells an investor whether a replacement candidate is priced fairly, and it needs more than one number on a flyer to answer that question. Sale comps, rent comps, cap rate context, and a tax-adjusted income figure all have to line up before a property earns a spot on the identification list.
What a Comparable Set Actually Needs to Include
Recent sale comps should come from the same asset class and, ideally, the same submarket, since a warehouse sale in Melville doesn't tell you much about pricing for a retail parcel on Sunrise Highway. Rent comps need to reflect what's actually being achieved on signed leases nearby, not only asking rents from listings that have been sitting unrented. Cap rate context should come from comparable recent closings, not a national average pulled from a report that doesn't reflect local conditions.
Comparable Data We Pull for Every Candidate
- recent sale comps in the same submarket and asset class
- current achieved rents on comparable nearby space
- a cap rate range specific to that asset type
- the current property tax bill, including any pending reassessment
- how the candidate's value fits against the investor's actual sale proceeds
Why Long Island Submarkets Price Differently Block by Block
A village center a short walk from an LIRR station commands different rents and pricing than a highway-facing parcel a mile away, even within the same town. Industrial space along the Route 110 and Hauppauge corridor generally trades differently than older industrial parks further out in Suffolk, reflecting both building quality and proximity to the highway network. Medical office near a Northwell hospital or outpatient campus can carry a different pricing logic entirely than a freestanding medical building without that adjacency, since tenant demand and lease terms tend to differ.
Property Taxes as an Underwriting Line, Not a Footnote
Two buildings that look nearly identical in size, age, and rent roll can carry very different tax bills depending on which town or village they sit in, and that difference changes the real return an investor will see. A comparable set that only tracks price per square foot without normalizing for tax burden can make a higher-taxed property look competitive when it actually underperforms once taxes are factored in. Pulling the current, actual tax bill for every comp, not an estimate, is what keeps this comparison honest.
When the Comp Set Doesn't Support the Deadline
If the available comps are thin, or every candidate in a given submarket looks overpriced relative to actual achieved rents, that's a signal to widen the geographic search or add a DST allocation as a backup, not a reason to pay above what the numbers support just because the clock is running. Overpaying to hit a deadline usually creates a worse outcome than accepting a slightly less convenient replacement path that's actually supported by the comparable data.
Adjusting Comps for Building Age and Condition
A sale comp from a fully renovated building doesn't translate directly to a candidate that hasn't been touched since it was built, even if both sit in the same submarket and the same asset class. Roof condition, HVAC age, and whether the electrical service has been upgraded all affect what a buyer should reasonably pay relative to a comp that looked newer on closing day. Adjusting the raw comp number downward for deferred maintenance, or upward for recent capital improvements, keeps the comparison honest instead of treating every building of similar size and location as interchangeable.
This adjustment matters more on Long Island's older building stock, where a property built in the 1970s or 1980s can sit two doors down from one that's had a full renovation, and the sale comps for each tell very different stories about what a buyer actually paid for. Noting these condition adjustments directly in the comparable set, rather than carrying them only in memory, gives the investor and their advisors a clear record of why one candidate was valued differently than another that looked similar on paper.
Common 1031 Exchange Questions
How recent do sale comps need to be to be useful?
Generally within the last six to twelve months, though this can stretch longer in a submarket with fewer transactions. Older comps still matter as context, but they need to be adjusted for any pricing shift since they closed.
Why do rent comps matter as much as sale comps?
A sale price only makes sense in relation to the income the property can actually produce, and that income depends on achievable rents, not asking rents from vacant listings. A strong sale comp attached to weak achievable rents doesn't support the same value conclusion.
Does the specific town or village really change the pricing that much?
Yes, tax rates, zoning flexibility, and proximity to transit or highway access vary meaningfully across Long Island's towns and villages, and all three factor into how a comparable property should be priced. Treating the whole region as one uniform market misses this.
What if there aren't enough comps in the exact submarket you're looking at?
Widening the search to a nearby, comparable submarket is usually better than relying on a thin data set from the immediate area. This is also a signal worth flagging early, since it affects how confident the investor should be in a given price.
Should property taxes change which property you identify?
They should at least factor into the decision, since two similarly priced properties with different tax bills can produce very different net returns. Comparing candidates on a tax-adjusted basis, not only price per square foot, gives a more accurate picture.
