Prtfolio — Data & Methodology

Last updated: August 15, 2026

Prtfolio's goal is to make fragmented real estate markets easier to understand.

Real estate data in many of the markets we cover can be incomplete, fragmented across sources, inconsistently reported, or unavailable at the neighborhood level. Prtfolio brings together multiple sources and analytical methods to create a more useful view of local markets.

Where Our Data Comes From

Depending on the market and metric, Prtfolio may use information from government agencies and public records; property listings and marketplaces; developers and real estate professionals; financial institutions and industry participants; infrastructure and planning documents; demographic and economic datasets; satellite, geospatial, and mapping data; field research; third-party data providers; and Prtfolio's own research and analytical models.

The sources used for individual metrics may vary by city and neighborhood.

Observed vs. Estimated Data

Not every Prtfolio metric represents a directly observed transaction.

Observed data — information obtained directly from an identifiable source, such as an official statistic, property listing, recorded transaction, or published development.

Aggregated data — information calculated from multiple observations, such as median asking prices or average rents.

Estimated data — information calculated or inferred using available observations, models, proxies, or related datasets.

Signals — indicators that Prtfolio believes may help users understand how a market is changing, such as population shifts, infrastructure investment, supply constraints, rental demand, development activity, or commercial activity.

Where practical, Prtfolio may identify the type, source, methodology, or last update associated with a metric.

Asking Prices vs. Transaction Prices

Property listing prices do not necessarily represent completed transaction prices.

Where a metric is derived primarily from property listings, it should be interpreted as an indication of asking prices or market positioning rather than a definitive measure of transaction value.

Estimates and Models

Some markets do not have sufficient transaction-level data to calculate reliable statistics directly. In these situations, Prtfolio may use statistical estimates, proxies, ranges, or models.

Models necessarily simplify real-world conditions. Their outputs should be treated as estimates rather than statements of fact.

Geographic Boundaries

Neighborhood and market boundaries may differ between official government definitions, commonly understood local boundaries, postal areas, and boundaries used by property platforms.

Prtfolio may create or normalize geographic boundaries to make comparisons possible.

Updates

Different datasets are updated at different frequencies.

Some information may update frequently while government statistics, infrastructure data, demographic information, and other datasets may update annually or less frequently.

Where available, Prtfolio may display the date or period associated with a metric.

Corrections

Real estate markets change quickly, and data errors can occur.

If you believe information displayed by Prtfolio is materially inaccurate, we welcome corrections and supporting sources.

Interpretation

Prtfolio's data is designed to help users identify patterns, ask better questions, and conduct further research.

No individual metric should be relied upon in isolation when making a real estate or investment decision. Users should independently verify material information before entering into a transaction.