Try searching "floor plans" or "architectural drawings." Images will have a license at the bottoms such as Public Domain or CC0 that dictate how you can use them.
Try searching for specific design or architectural features. The key goal of The Commons is to share hidden treasures from the world's public photography archives.
Try searching for specific features, "design plans" or "floor plans." Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more.
Part of the American Memory Project, this collection contains more than 350,000 measured drawings, photographs, and written histories in architecture, engineering, and design in the United States and its territories.
Search over one million digital images in the fields of the arts, architecture, humanities, and sciences. As of August 1st, 2024, ARTstor is available exclusively at JSTOR.
This database searches architectural drawings held by Special Collections focusing on the architecture and architectural firms of the Pacific Northwest.
Includes more than 660,000 Sanborn maps charting the growth and development of more than 12,000 American towns and cities. Requires Account with Seattle Public Library
Chicago Non-Profit Library's Map Resources , Digital Map Collection, broken-up by topic with essays in cartographic movement and the ideas and information they present