Does ATTOM have a documented REST API?

Yes. ATTOM provides a documented REST API at api.gateway.attomdata.com with a JSON response format. The API is covered by ATTOM's developer documentation and supports lookup by address, APN, or geography. Authentication is via an API key passed as a request header. This is a native-api integration: you can call it directly from n8n, Make, Python, or any HTTP client without scraping or third-party middleware. Bulk file exports are also available for teams that prefer to ingest the full national dataset into their own database.

What property data can I retrieve from the ATTOM API?

ATTOM's API covers property characteristics (SF, year built, units, zoning), ownership and owner mailing address, recorded sales transaction history, tax assessment and delinquency status, AVM with confidence score, comparable sales, foreclosure and pre-foreclosure filings, parcel boundaries (GeoJSON), and neighborhood demographics. Available modules depend on your subscription tier — property detail and sales history are available on most plans, while AVM, foreclosure data, and bulk files may require add-on modules. Contact ATTOM sales to configure the right plan for your use case.

Can I enrich my CRM automatically with ATTOM property data?

Yes, and this is one of the highest-ROI automations for CRE acquisition teams. Using n8n, you can trigger an ATTOM enrichment call whenever a new property address enters your CRM (via deal form, broker email parser, or manual entry). The workflow queries ATTOM for ownership, assessment, AVM, and sales history, then writes the results back to custom fields in HubSpot, Airtable, Salesforce, or any CRM with an API. Analysts open new deal cards to find a complete property intelligence snapshot already populated — no manual lookups required.

Does ATTOM cover commercial property or only residential?

ATTOM covers both residential and commercial property. The database includes apartment buildings, office, retail, industrial, and mixed-use assets alongside single-family and multifamily residential. Coverage and data depth vary by property type and market — commercial property data is generally strongest in high-transaction markets. For commercial comps and detailed rent data, ATTOM is most effective as an ownership and transaction-history layer, complemented by a commercial-specific data source (such as Cherre or a CoStar subscription) for rent comps and occupancy metrics.

Can AI use ATTOM data to source off-market deals?

Yes — and this is where ATTOM becomes significantly more powerful than a simple data lookup. AI running on top of ATTOM ownership and transaction data can cross-reference hold period, assessed-to-market discount, tax delinquency status, and owner entity type against your buy-box criteria to score every property in a target market. Instead of reviewing 500 raw records from a ATTOM market scan, your team sees a ranked list of the 20 most likely sellers with a pre-written outreach rationale for each. The AI does not invent motivation — it synthesizes signals from the ATTOM record that human analysts would otherwise evaluate one property at a time.

How is ATTOM priced and what is the minimum subscription?

ATTOM uses a tiered subscription model priced by data module access and API call volume. There is no free tier — all access requires a paid subscription. Pricing is negotiated with ATTOM's sales team based on your geography, property type coverage, and call volume needs. Bulk file subscriptions are priced separately from API call volume. For most small-to-mid-size acquisition teams building enrichment and sourcing automations, an entry-level API subscription covering property detail, ownership, and sales history is sufficient to start. Contact ATTOM sales at attomdata.com to request pricing for your use case.

Do I need a developer to integrate ATTOM with my workflow tools?

Not necessarily. ATTOM's REST API returns standard JSON and authenticates via a single API key header — both compatible with n8n's HTTP Request node without custom code. An operations professional comfortable with n8n or Make can build property enrichment and sourcing workflows without writing code. The primary complexity is in mapping ATTOM's nested JSON response structure to your CRM fields, which requires understanding the ATTOM API documentation and basic JSON path notation. For more complex use cases (batch processing large property lists, custom scoring models, or bulk file ingestion), a developer will accelerate the build.

How does ATTOM compare to pulling data from public county records?

County assessor and recorder websites provide the same underlying data ATTOM aggregates, but in fragmented, inconsistently formatted, and often un-searchable form — typically as PDFs or poorly structured HTML. ATTOM normalizes records from 3,100+ U.S. counties into a single consistent API format, enabling automated lookups at scale. The difference is: querying one county assessor website for a single property takes 3-5 minutes and cannot be automated reliably. Querying ATTOM for 500 properties takes about the same time via API. For any team screening more than a handful of properties per week, ATTOM's aggregation cost pays for itself in analyst time saved.

ATTOM Data Integration

AI & Automation

What It Does

ATTOM Data Solutions is a nationwide property data provider covering more than 155 million U.S. property records. It delivers parcel boundaries, property characteristics, ownership history, tax assessments, sales transactions, AVMs, foreclosure filings, and neighborhood demographics through a documented REST API and bulk data file exports — making it integrator-friendly out of the box.

Why Real Estate Professionals Use It

CRE acquisitions and debt teams run on property data: who owns a building, when they bought it, what they paid, how the assessment has trended, whether there are delinquent taxes, and what comparable assets have traded at. Historically, assembling that picture meant logging into multiple paid portals and copy-pasting into spreadsheets — a 20-minute ritual per property that doesn't scale when you're screening 200 targets a month.

Visit ATTOM Data

AI Solutions for AI

Ebook

Real Estate AI Playbook

10 AI workflows every agent needs for lead generation and client management

Solution

AI Lead Scoring Engine

Score and prioritize leads using AI based on engagement signals

Solution

AI Follow-Up Sequences

Personalized email and SMS sequences that adapt based on recipient behavior

Key Features for Real Estate

Discover how ATTOM Data powers real estate automation workflows

1 of 8

Feature

Property Characteristics API

Query detailed building and land attributes — square footage, year built, lot size, number of units, zoning, building class, and construction type — for any U.S. parcel by address or APN.

Real Estate Impact

Eliminates manual CoStar lookups for basic property specs. Your n8n workflow can auto-populate the 'Property Overview' section of an underwriting model the moment an address enters your pipeline.

See how we automate ATTOM Data

Get a personalized plan for your tech stack

Get Your Free AI Roadmap

Automation Workflows

Ready-to-deploy workflows powered by ATTOM Data + NextAutomation

Workflow 1 of 4

Intermediate

New Property Lead → Auto-Enrich → CRM Deal Creation

When a new property address enters your pipeline (from a broker email, a direct-mail response, or a web form), this workflow instantly queries ATTOM for ownership, tax assessment, sales history, and AVM, then creates a pre-enriched deal record in your CRM with all key fields populated. The analyst opens the deal card to find a complete property intelligence snapshot — no manual lookups required.

Trigger: New property address captured in pipeline (webhook from deal-submission form, Gmail parser, or Airtable row created)

Workflow Steps

1n8n receives property address from trigger source

2n8n calls ATTOM Property Detail API with address to retrieve owner name, entity type, mailing address, year built, SF, and zoning

3n8n calls ATTOM Sales History endpoint to calculate hold period and last sale price

4n8n calls ATTOM Tax Assessment endpoint to retrieve assessed value and delinquency status

+4 more steps

Every new lead arrives in your CRM as a fully enriched deal card. Analysts skip the 20-minute manual enrichment ritual and go straight to reviewing the opportunity. Deal-review capacity increases without adding headcount.

Triggers & Actions

Connect ATTOM Data to your workflows with powerful triggers and actions

Triggers

Actions

Lookup Property by Address

Query the ATTOM Property Detail endpoint with a street address to retrieve the canonical APN and basic property summary.

When a broker emails an off-market teaser with a property address, instantly resolve the APN and retrieve the full ATTOM property record to pre-populate the deal card.

Fetch Owner of Record

Retrieve the current owner name, entity type (individual, LLC, trust, corporate entity), and owner mailing address for any parcel by APN or address.

After identifying a target property from a market scan, pull the owner of record to determine if it is an institutional owner (lower contact probability) or a private individual or family LLC (higher probability of off-market receptivity).

Fetch Sales Transaction History

Retrieve the complete recorded sales history for a property — sale date, recorded price, buyer and seller, and instrument type.

Calculate how long the current owner has held the asset and what they paid. A 12-year hold at a below-market basis is a strong off-market outreach signal.

Fetch Tax Assessment Record

Retrieve the current assessed land and improvement values, tax year, total tax billed, and any delinquency flag.

Flag properties where assessed value is 30%+ below estimated market value — a signal that the owner may be unaware of appreciation or reluctant to trigger a reassessment by selling.

Fetch AVM (Automated Valuation)

Request ATTOM's AVM estimate and confidence score for a property. Returns an estimated value range and a model confidence tier.

Use the AVM as a first-pass screening filter: if the AVM is 20%+ below an asking price, flag for analyst review before committing diligence time.

Fetch Comparable Sales

Retrieve recent sales of comparable properties within a configurable radius and property-type filter, with sale price, date, SF, and price-per-SF.

Auto-populate a comps table in your underwriting model whenever a new deal reaches the 'Active Underwriting' stage, saving the analyst 30-45 minutes of manual comp assembly.

Fetch Property Characteristics

Retrieve building attributes — gross SF, year built, lot size, units count, building class, construction type, zoning — for any parcel.

Auto-fill the Property Overview section of a deal memo template when an address is entered, eliminating manual data entry for every screening call.

Fetch Foreclosure Filings by Geography

Query for new Notice of Default, Lis Pendens, or scheduled auction filings within a target ZIP code or county, filtered by asset type and filing date range.

Run a daily scan of target markets and surface new pre-foreclosure filings that match your buy-box before competing buyers find them through manual courthouse searches.

Fetch Parcel Boundary (GeoJSON)

Retrieve the GeoJSON polygon representing the legal parcel boundary for any property by APN or address.

Overlay parcel boundaries on a market map to visualize clustering of target properties and identify assemblage opportunities near portfolio assets.

Batch Enrich Multiple Properties

Submit a batch of APNs or addresses to ATTOM's batch endpoints and receive enriched property records in bulk, reducing API call overhead for large sourcing lists.

After running a market scan that identifies 500 candidate properties, enrich the full list with ownership and hold-period data in a single batch job rather than 500 sequential API calls.

Fetch Neighborhood Demographics

Retrieve neighborhood-level demographic, income, and housing trend data for any address — school ratings, median income, population change, and housing vacancy rates.

Enrich market-report sections of an investor deck with ATTOM neighborhood data, replacing manually gathered census lookups with an automated data pull.

Setup Guide

Get started in approximately 45 minutes for initial API test and first enrichment workflow; 2-3 hours for full sourcing and alert workflow suite

Prerequisites

ATTOM Data subscription (contact ATTOM sales at attomdata.com — plans are tiered by data modules and call volume; API keys are provisioned after subscription activation)
ATTOM API key (provided in your ATTOM account dashboard after subscription activation)
n8n instance (cloud or self-hosted) with HTTP Request node — no dedicated ATTOM n8n node required; all calls are standard REST
A CRM or spreadsheet destination (HubSpot, Airtable, or Google Sheets) for enriched records
Basic familiarity with JSON and REST API authentication headers

Activate Your ATTOM Subscription and Retrieve Your API Key

Visit attomdata.com and contact their sales team to activate a subscription tier matching your data needs (property detail, comps, foreclosures, AVM are common add-ons). Once activated, log in to your ATTOM account portal and navigate to the API keys section. Copy your API key — you will pass it as a header (`apikey: YOUR_KEY`) on every request.

Ask ATTOM sales for a sandbox or trial API key scoped to a single county during initial development. This lets you test your workflows without exhausting production API quota.

Test the ATTOM API with a Single Property Lookup

Before building any workflow, confirm your key works. In n8n, add an HTTP Request node. Set Method to GET, URL to `https://api.gateway.attomdata.com/propertyapi/v1.0.0/property/basicprofile`, and add a query parameter `address1` with a known street address and `address2` with the city and state. In Headers, add `apikey: YOUR_KEY` and `Accept: application/json`. Execute the node — you should receive a 200 response with a JSON property record.

Save the ATTOM API key as an n8n credential of type 'Header Auth' with Header Name `apikey`. This lets you reuse it across all ATTOM nodes without re-entering the key.

Map the ATTOM JSON Response to Your CRM Fields

ATTOM returns deeply nested JSON (owner data is in `property[0].building`, assessment data in `property[0].assessment`, etc.). In n8n, add a Set or Code node after your HTTP Request to extract the fields you need: owner name, last sale date, assessed value, AVM, and property characteristics. Map these to the corresponding custom fields in your CRM.

Build a reusable n8n sub-workflow called 'ATTOM Enrichment' that accepts an address input and returns a flat object with all extracted fields. Reference this sub-workflow from every sourcing and deal-intake workflow so you maintain the mapping logic in one place.

Build the Property Enrichment Workflow

Create your first end-to-end workflow: Trigger (form submission or CRM webhook) → HTTP Request (ATTOM property detail) → HTTP Request (ATTOM sales history) → HTTP Request (ATTOM tax assessment) → Set node (flatten JSON) → CRM node (create or update deal). Run a test with a real property address in your target market and verify all fields populate correctly in your CRM.

Add an error branch after each ATTOM HTTP Request node. If ATTOM returns no records for an address (non-standard addresses can fail), route the workflow to create the deal with a 'Needs Manual Enrichment' flag rather than failing silently.

Schedule Your Sourcing Workflows

For recurring workflows (long-hold owner scan, foreclosure filing alert), add a Cron Trigger node at the start of the workflow and configure the schedule. For the owner scan, weekly is typically sufficient. For foreclosure alerts, daily is recommended. Activate the workflows in n8n and monitor the first few runs to verify filtering and scoring logic.

Log a record count to a Google Sheet or Slack message at the end of each scheduled run (e.g., '47 properties scanned, 12 qualified, 3 flagged for outreach'). This makes it easy to spot if a workflow starts returning zero results due to an API change or filter misconfiguration.

Frequently Asked Questions

Common questions about ATTOM Data integration

Related Integrations

Explore other tools that work great with your workflow

HubSpot

CRM & Lead Management

All-in-one CRM for running your acquisition deal pipeline and broker/investor relationships from first touch to close.

Salesforce

CRM & Lead Management

Enterprise CRM platform for CRE investment and development firms managing complex acquisition pipelines and LP/investor relationships at scale.

Slack

Communication & Follow-Up

Real-time team alerts for new deals, due-diligence milestones, and IC decisions to keep your CRE investment platform in sync.

Google Sheets

Documents & Transactions

Automate underwriting models, rent rolls, and acquisition pipeline trackers in spreadsheets your investment team already uses daily.

Airtable