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Buyer guide · Property due diligence

Buying on Long Island: Checks Beyond the Listing

Build an address-specific Nassau or Suffolk purchase checklist for tax records, municipal approvals, boundaries, systems, commute and ownership costs.

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Nassau and Suffolk purchase preparation; requirements must be verified with the responsible offices for the address.

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A mailing address is not a complete due-diligence plan. Identify the county, town or city, any relevant village, and the offices responsible for the records your attorney and inspector need.

For a Nassau property, the County’s assessment resources and Land Records Viewer are useful starting points for tax and property information. They do not replace building approvals, title work or a physical inspection. Nassau County — Property Assessment · Nassau County — e-Services / Land Records Viewer

Request the whole tax picture and the alteration history

Ask for the current tax bills and identify which charges are included in the listing’s annual figure. Check applicable benefits, payment periods and known changes. Use the relevant local office for the address; do not apply an NYC property-tax assumption or transfer-tax calculation automatically outside the City.

Make an alteration list during the showing: extensions, finished lower levels, additional kitchens, converted garages, decks and other material changes. Ask the appropriate building department and your professionals what records and approvals are required. A feature appearing in an old listing is not, by itself, evidence of an approval.

Investigate the land and the systems you will maintain

Use a property-specific checklist rather than assuming every home has the same infrastructure. Ask about the actual wastewater arrangement, water supply, heating fuel, equipment age, drainage, and any current or former tanks. Your inspector should identify where specialist assessment is appropriate.

Ask your attorney and survey professional about boundaries, shared driveways, recorded easements and apparent encroachments. Request the supporting records for parking, fences or structures that materially affect your plans.

For a coastal or lower-lying property, use the flood-review checklist as well. A dry inspection day does not answer the history of stormwater or groundwater problems.

Verify the daily-use assumptions yourself

Test the actual commute, including access to the station, parking arrangements and the time of day you expect to travel. Verify school assignment and enrollment requirements with the appropriate district; a listing description is not an enrollment guarantee.

Compare objective property characteristics and your stated needs. Do not rely on demographic assumptions about which people belong in a community.

Does a county property record prove an extension is permitted? Ask the correct permitting office and your professionals; different records serve different purposes.

Should I use the NYC closing-cost table? Only for items actually applicable to the transaction. Request a county- and property-specific estimate.

Bring the address, listing and unresolved items to B Square Realty before you make a decision that depends on them.

Sources & context

General educational guidance. Confirm current requirements and your circumstances with the appropriate legal, lending, tax, inspection, or insurance professional.

Bring your property questions.

An agent can help organize the next steps for your purchase. Confirm financing and legal decisions with your lender and attorney.

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