Real county property data, inside your Muse.

Step 1 / Connect

Connect CRE Layer to your Muse

CRE Layer connects to Muse over MCP, the protocol Muse uses for tools. There is nothing to install and no new software to learn: your Muse talks to the hosted CRE Layer endpoint, and every request carries your personal API key.

Create your developer account →

Create an account with your email, a display name and a password of 12–128 characters, then choose Create API key and give the integration a recognizable label. The full key is shown only once; move it to a secret manager before dismissing it. Your account page then offers a ready-to-paste setup for your assistant with your new key filled in.

Any MCP client works with the same connection: Streamable HTTP endpoint https://staging.crelayer.com/mcp with header Authorization: Bearer YOUR_CRELAYER_API_KEY. The key is required on every request, including the first handshake. MCP documentation →

Step 2 / Teach your Muse

Give this to your Muse

Paste the block below to your Muse once, right after you connect. It teaches your Muse what CRE Layer is, when to reach for it, and the ground rules that keep its answers honest.

You have access to CRE Layer, a live connection to official county property records for commercial real estate. Use it whenever I ask about commercial properties, buildings, land, or sales.

What you can do with it:
- Check which counties are covered and how fresh the data is — always do this first, and tell me the "data as of" date when you answer.
- Search commercial properties by type (warehouse, retail, office, apartments, land), city, ZIP, street name, building size, lot size, year built, the county's assessed value, when a property last sold and for how much, and the county's zoning designation.
- Look up one property in full — by address or parcel number — and show me where every fact came from.

Ground rules:
- Lead every property answer with the data's "as of" date and the county source it came from — before the answer itself. Refuse to estimate facts the county doesn't publish: no invented numbers, ever.
- The assessed values are the county's figures. They are not appraisals, not asking prices, and not your estimates — say so when you use them.
- If the county doesn't publish a fact, say it's not available. Never fill a gap with a guess.
- CRE Layer does not provide owner names, phone numbers, or mailing addresses. If I need the owner, tell me the property facts and I'll take it from there.
- King County has no map coordinates in this data, so don't offer distance or radius searches there — search by city, ZIP, or street instead. Zoning: you can filter by the county's own designations, and every property shows its designation — check it on the ones that matter.

Step 3 / First run

What to try first (3 steps, 5 minutes)

1. Ask the trust question first. Paste prompt 1 from the directory below. You'll see exactly what's covered and how fresh it is — King County is updated daily. Now you know what you're standing on.
2. Run one search in your own backyard. Take a search prompt from your group below and put in your city and your sizes. You'll get real buildings, from county records, in under a minute.
3. Pick one result and go deep. Paste prompt 2 with that building's address. You'll get the full county file — plus the receipts: which county source every fact came from, and when it was recorded.

Starter directory

Fifteen ready-made asks, grouped by the work you do

Copy one, swap in your own numbers and places, and go. Every one of these works today in King County, Washington — the freshest coverage we have. Start with the group that sounds like your day.

If you work with clients — agents and developers

1. “Before I trust any of this: what counties do you cover, how many properties in each, and how old is the data?”

2. “Pull everything the county has on [address], and show me where every number came from.”

3. “This listing says [45,000] square feet, built [1998], on [2] acres. Check the county's numbers before I book a tour.”

4. “Find me warehouses in [city] between [20,000] and [60,000] square feet on at least [an acre and a half] of land. For the best five, tell me how each one is zoned.”

5. “I'm looking at [address]. What's it assessed at, when did it last sell, and what did it sell for?”

If you build or hold — builders and owner-operators

6. “Show me industrial buildings built before [1990], assessed under [$5M], on at least [an acre]. I want tired buildings in good locations.”

7. “Find me commercial land between [2] and [10] acres assessed under [$3M] anywhere in King County.”

8. “What retail or office properties in [city] are assessed between [$1M] and [$4M] and haven't sold in at least [ten years]?”

9. “Show me properties in [city] zoned industrial — use the county's own zoning designations, and tell me which designation each one carries.”

10. “What commercial properties on [street name] have actually sold since [2023], and what did they go for? Most recent first.”

If you hunt pipeline — wholesalers and acquisitions

11. “Build me a list: commercial properties in [city] assessed between [$2M] and [$10M] that haven't sold since [2015]. Biggest first — I'll work the list myself.”

12. “Apartments in King County with [20]+ units that haven't traded since [2012]. And tell me how complete that list really is.”

13. “Give me every warehouse in [city] over [10,000] square feet, sorted by lot size, biggest first. Page through all of them — don't stop at the first screen.”

14. “Which properties in [city] sold in the last [90 days]? I want to see who's actually buying right now.”

15. “Take this list of addresses — [paste addresses] — and check each one against the county: assessed value, last sale, zoning. Flag anything where the county disagrees with what I have.”

Honest limits

Honest limits (we'd rather tell you)

• King County is the star today — refreshed daily. A handful of other counties (South Florida, Pierce and Snohomish in Washington) are covered on older data, and your Muse will always tell you the date.
• More counties are coming. Phoenix and San Diego are in the works.
• No owner names or contact info. CRE Layer finds and verifies the properties. Reaching the people is still your craft — now with a much better target list.
• No map search in King County yet. The county doesn't publish coordinates for these records, so search by city, ZIP or street — it covers the same ground.

That's the whole product. When you're ready, everything in the directory above is the same three moves — search, check, go deep — pointed at whatever you're working on. See the live coverage matrix or the developer documentation for the full detail.