CoStar Data Parser & API

CoStar is the leading US commercial real estate data and analytics platform — a subscriber portal carrying property records at a 153M+ record scale class — and PropAPIS extracts its property, building, and comps data through a single REST API. Access CRE property records, building attributes, ownership, and lease/sale comps without building or maintaining a scraper.

CoStar Group is the parent of the largest US real-estate consolidation — Apartments.com, LoopNet, Homes.com, and Homesnap — so PropAPIS’s CoStar-cluster coverage spans the corporate data stack. CoStar itself is a paid subscription product with no public API.

Platform Overview

CoStar (costar.com) is the subscription-only commercial real estate data leader operated by CoStar Group, spanning the US, Canada, UK, and France. It is a subscriber portal — not a free listing site — carrying CRE property records at a scale class cited around 153M+ records (SimilarWeb — costar.com ). It is the data backbone of the broader CoStar network that includes Apartments.com, LoopNet, Homes.com, and Homesnap.

Market Coverage

Geographic Coverage:

• US, Canada, UK and France
• All major CRE markets and asset classes

Property Types:

• Office, retail, industrial and multifamily
• Hospitality and special-purpose CRE
• Land and development sites

Data Availability

CoStar exposes the richest CRE record set — building attributes, ownership, lease and sale comps, tenants, and zoning. As the data backbone of the CoStar network, it shares its corporate stack with Apartments.com, LoopNet, Homes.com, and Homesnap.

Data Fields Available

PropAPIS extracts the full CRE record field set from each CoStar property:

Property Basics

• Address: Full property address (real-time)
• Property Type: Office, retail, industrial, multifamily (static)
• Building Size: Gross / rentable square footage (static)
• Building Class: A / B / C classification (static)
• Year Built: Construction year (static)

Records & Comps

• Owner: Ownership records (real-time)
• Lease Comps: Comparable lease transactions (real-time)
• Sale Comps: Comparable sale transactions (real-time)
• Tenants: Tenant roster (where available)

Attributes & Location

• Zoning: Zoning designation (static)
• Coordinates: Latitude and longitude

API Endpoints

PropAPIS exposes CoStar CRE record data through search and detail endpoints under api.platforms.costar. Use search_properties to query by location and CRE criteria, and get_property for the full property record including comps.

Quick Start

Extract CoStar CRE records with the PropAPIS SDKs or a direct REST call.

from propapis import PropAPIS
 
api = PropAPIS(api_key='your_api_key')
 
# Search CRE property records
properties = api.platforms.costar.search_properties(
    location='Chicago, IL',
    property_type='Office',
    min_building_size=50000,
)
 
for prop in properties[:5]:
    print(f"{prop.address} — {prop.building_size:,} sqft  Class {prop.building_class}")
    print(f"  Owner: {prop.owner}")

import { PropAPIS } from 'propapis';
 
const api = new PropAPIS({ apiKey: 'your_api_key' });
 
const properties = await api.platforms.costar.searchProperties({
  location: 'Chicago, IL',
  propertyType: 'Office',
  minBuildingSize: 50000,
});
 
for (const prop of properties.slice(0, 5)) {
  console.log(`${prop.address} — ${prop.buildingSize.toLocaleString()} sqft`);
}

curl "https://api.propapis.com/v1/platforms/costar/properties" \
  -H "Authorization: Bearer your_api_key" \
  -G \
  --data-urlencode "location=Chicago, IL" \
  --data-urlencode "property_type=Office" \
  --data-urlencode "min_building_size=50000"

Frequently asked questions

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