Gary Demolition Impact Analyzer

Map
Micro view
Analytics
Data table
Scraper
Circle Color = TVC Score  |  Circle Size = CPI Score  |  Click to Explore
Select a property from the map or table
Median Cluster TVC:—
|
CPI:—
|
Score:—
— properties Neighborhood: use left sidebar

Input Data

Demo year:
Please select a demo year before starting.
Please enter at least one address.
One address per line · Gary, IN assumed
All addresses will be assigned the demo year selected above.
Example: 400 Mount Street
0 addresses detected
No input provided — will use HHF_Properties_List_Gary_IN.xlsx (227 properties)

Configuration

Associated properties below this threshold are disqualified
400m → 800m → 1,200m passes
Minimum 5s — do not reduce
⚠ Minimum delay is 5 seconds

Progress

227
Total
0
Completed
227
Remaining
—
Rate
0
Disqualified
0
Flags
Full sample progress0 / 227 (0%)
Current batch—
Started—
Elapsed—
Remaining—
Est. done—

Log

Controls

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Glossary

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TVC — Total Valuation Change

The % change in a neighboring property's assessed value from the year after demolition through 2024. The primary measure of long-term neighborhood recovery. A positive TVC means the property appreciated over the full period since the demolition occurred.

SVC — Short-Term Valuation Change

The % change in a neighboring property's assessed value across the first three years following demolition. Captures the immediate neighborhood response to blight removal — whether nearby homes began recovering quickly or continued to decline in the short term.

CPI — Cluster Performance Index

A ratio comparing the median TVC of the three neighbors around a specific demolition site to the median TVC of all properties in that neighborhood. A CPI above 1.2 means that block outperformed its neighborhood. A CPI below 0.8 means it lagged. This controls for citywide or neighborhood-wide market forces.

Focal property

The address where a blighted structure was demolished under Gary's HHF demolition program between 2014 and 2016. Shown as the center node (F) in the micro view. Its value history is displayed as context only — it is never scored.

Associated properties (A1, A2, A3)

The three nearest qualifying residential properties to each demolished lot. All scoring and metrics are built from their data — they represent the neighborhood's response to the demolition.

TVC Score (0–5)

A simple rating of how strongly a demolition site's neighbors appreciated over the long term. Score 5 means neighbors gained more than 75% in assessed value since demolition. Score 0 means they declined more than 10%. The score shown for each site is the median across its three associated properties.

Neighborhood median TVC

The median Total Valuation Change across all associated properties within a given neighborhood. Used as the baseline for computing the Cluster Performance Index — it represents what a typical neighbor in that neighborhood experienced.

Benchmark Negative (⊘)

Shown in place of a CPI value when the neighborhood median TVC is zero or negative. In this case, the CPI ratio is mathematically undefined or misleading — dividing by a negative baseline would produce a number that reverses direction and cannot be interpreted as a performance ratio. Sites in these neighborhoods are excluded from CPI ranking but are still scored on TVC.