Property Tax Assessment

Get land values right.

Fair property taxes depend on accurate, transparent valuations, and too often land is the part assessors get wrong.

Mass Appraisal for the Masses

Start here: Lars Doucet's 6-part series on how property gets valued, how to tell whether an assessment is fair, and how to value land on its own.

Read the series

February 2026

A statewide analysis showing Baltimore as the clear outlier in residential vacant land undervaluation.

August 2025

How systematic undervaluation of vacant parcels shifts tax burdens and reinforces speculative blight incentives.

Map

Your city's land, in 3D: where land value concentrates, and how much sits idle under vacant lots and surface parking. 25 cities across 14 states.

Open-source tool

A free, open-source mass appraisal toolkit for assessors, researchers and analysts: enrich data, run AVMs, and produce IAAO-style ratio studies.

Explainer

Our thesis: how land speculation drives unaffordability, and the two ways to return land value to the public — lease the land, or tax it.

Series

Lars Doucet's series on how property gets valued, how to tell whether assessments are fair, and how land can be valued separately from buildings.