Mapping the Age of Every Building in Los Angeles

Developed using open data from local government sources, built: LA is a mapping tool that displays the age of every building in the county. Much of the area's built environment is surprisingly old.

1 minute read

June 19, 2015, 12:00 PM PDT

By Philip Rojc @PhilipRojc


Angelino Heights

Konrad Summers / Flickr

CityLab's Laura Bliss reports on an interesting new data visualization tool. "Construction in Los Angeles may have exploded during the postwar era, but as a new interactive map shows, the wide age range of its buildings might surprise you."

"Using open data from local governments, built: LA visualizes the age of roughly 3 million buildings across L.A. County constructed between 1890 and 2008. Drag your mouse to explore the vast web of communities and neighborhoods, hover over individual properties to discover birth years, and double click to zoom in further."

"Perhaps best of all, hit the rainbow stopwatch to view a decade-by-decade timelapse of development across the county. The city's core, in particular, clusters together buildings of century-spanning generations, while suburbs and communities to the east and west tend to represent just one or two decades of development."

Thursday, May 28, 2015 in CityLab

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Get top-rated, practical training

Close-up of park ranger in green jacket and khaki hat looking out at Bryce Canyon National Park red rock formations.

National Parks Layoffs Will Cause Communities to Lose Billions

Thousands of essential park workers were laid off this week, just before the busy spring break season.

February 18, 2025 - National Parks Traveler

Paved walking path next to canal in The Woodlands, Texas with office buildings in background.

Retro-silient?: America’s First “Eco-burb,” The Woodlands Turns 50

A master-planned community north of Houston offers lessons on green infrastructure and resilient design, but falls short of its founder’s lofty affordability and walkability goals.

February 19, 2025 - Greg Flisram

Small rural USPS post office in manufactured one-story grey building with American flag in front.

Delivering for America Plan Will Downgrade Mail Service in at Least 49.5 Percent of Zip Codes

Republican and Democrat lawmakers criticize the plan for its disproportionate negative impact on rural communities.

February 12, 2025 - Cowboy State Daily

Chicago

Test News Post 1

This is a summary

April 8 - 2TheAdvocate.com

test alt text

Test News Headline 46

Test for the image on the front page.

March 5 - Cleantech blog

Military humvee driving through gate at Fort Indiantown Gap Natl Guard training center in Pennsylvania surrounded by winter trees and dead leaves.

Balancing Bombs and Butterflies: How the National Guard Protects a Rare Species

The National Guard at Fort Indiantown Gap uses GIS technology and land management strategies to balance military training with conservation efforts, ensuring the survival of the rare eastern regal fritillary butterfly.

February 24 - Esri Blog