🏠 Vernon Neighborhood Landlord Transparency Tool

Analyze property ownership patterns to identify potential predatory landlord behavior

📊 View Source on GitHub

📖 About This Tool

🏘️ Any Neighborhood Can Use This

While our sample data is from Portland's Vernon neighborhood, this tool works for any community. Upload assessor data from your neighborhood to identify concerning ownership patterns.

🔍 What We Analyze

The tool identifies potential predatory landlord behavior including large property portfolios, below-market purchases, bulk buying patterns, and data anomalies that may indicate shell companies.

👥 Who Can Use This

Tenant organizers, housing advocates, journalists, researchers, and community members who want to understand property ownership patterns in their neighborhood.

📊 How to Get Your Neighborhood's Data

1

Visit Portland Maps

Go to portlandmaps.com

2

Use Advanced Search

Click "Advanced" → "Assessor"

3

Export Results

Select your neighborhood. Click "Search". After running your search, look for "CSV" button to download a CSV file with property data including owner names, sale dates, and prices.

4

Upload & Analyze

Upload your CSV file below to analyze ownership patterns in your community. The tool works with any Portland assessor data format.

🔒 Your Data Stays Private

All analysis happens locally in your browser. No data is sent to external servers. You control what information you upload and analyze.

📁 Upload Your Neighborhood's Data

Upload a CSV file from portlandmaps.com. The file should include property owner names, sale dates, and prices for analysis.

Drop your CSV file here or click to browse

Don't have data yet? Try our sample datasets:

📋 Methodology

Red Flags We Detect:

  • Large Portfolios: Owners with 5+ properties
  • Below-Market Purchases: Sales below 70% of neighborhood median
  • Bulk Purchasing: Multiple properties bought in same year
  • Data Anomalies: Properties with YEAR_BUILT = 9999 or sale dates from 1900
  • Corporate Entities: LLCs and corporations with generic names

Data Sources:

This tool analyzes Portland assessor data to identify patterns that may indicate predatory landlord behavior. All analysis is performed locally in your browser for privacy.