Investing in Seattle Real Estate: A Due-Diligence Checklist Before You Buy

By Maggie Sun, Managing Broker, Maggie Sun Real Estate Group

Seattle attracts plenty of interest from real estate investors, including many who live in other states or countries. But a strong regional economy does not make every property a good investment. The decision should come down to one question: does this specific property still work under conservative assumptions?

Here is a practical due-diligence framework to use before you make an offer.

1. Define the job of the property

A long-term rental, an owner-occupied house hack, a redevelopment play and a long-term hold for capital preservation each need different evidence, financing and risk limits. Decide the strategy first; it determines which numbers matter most.

2. Build income from evidence, not hope

Use comparable rentals for similar size, condition and location, and check how long they took to lease. Avoid using the highest asking rent you can find. Include a vacancy allowance and assume turnover will happen.

3. List every operating expense

• Fixed costs: property tax for the exact parcel, insurance, HOA dues if any.
• Operating costs: property management, utilities you pay, landscaping, routine repairs.
• Capital reserves: roof, heating and cooling, water heater, windows and other big-ticket items.
• Compliance: rental registration, inspections and other local requirements.

Subtract these from realistic income to estimate net operating income (NOI). Keep financing separate: NOI measures the property; your loan terms determine your cash flow.

4. Understand local rental rules

Seattle has its own landlord-tenant rules and rental registration requirements, and they can differ from nearby Eastside cities. Review current requirements with the City of Seattle rental housing resources and consult a local attorney or property manager about how they apply to your plan. HOA rules can also restrict rentals in condos and some communities.

5. Inspect for operating risk

An older house may need sewer, foundation or drainage work; a condo may carry special assessment risk. Order a professional inspection and, where appropriate, a sewer scope. For condos, read the HOA budget, reserve information and meeting minutes.

6. Run three scenarios

• Base case: realistic rent, vacancy and expenses.
• Downside: lower rent, longer vacancy and a major repair.
• Stress test: higher interest rate at refinance or a slower resale market.

If the deal only works in the best case, walk away. Do not rely on appreciation to fix weak current numbers.

7. Plan taxes and the exit early

Depreciation, capital gains, state excise tax on sale and, for foreign owners, FIRPTA withholding all affect returns. Talk to a qualified CPA before buying, not after. Also think about who will buy the property from you later and what condition it will need to be in.

Common mistakes to avoid

• Using listing-sheet rent estimates without checking comparable leases.
• Skipping capital reserves because the home "looks updated."
• Ignoring management time if you live far away.
• Treating projected appreciation as guaranteed.