The University Archives holds a wealth of material documenting the construction and layout of campus and buildings since 1903. 

This includes: 

• Architectural drawings of campus buildings
• Master Plan documents (up to 2011 also available on Digital Commons)
• Maps of campus
• Land Use records
• History of campus landscape
• Historical research on campus buildings and sites
• Historic photos and audiovisual materials documenting the campus

Helpful places to start:

• Check out the Special Collections and Archives online exhibit "Building Cal Poly" for a brief introduction to a century of campus growth.
• Interactive map timeline of campus buildings, 1903-present
• Brief overview of residential housing history on campus
• Introduction to the campus layout

Many maps of Cal Poly are digitized and browsable at the Online Archive   

Here are selected representative maps found at the links above, in chronological order:

• 1902 map of properties that became Cal Poly
• 1909 Map of Cal Poly
• 1925 map of Cal Poly in the 1925-26 Course Catalogue
• 1938 Poly Royal map
• 1943 Map of Cal Poly as a naval school
• 1956 Campus Map
• 1968 Master Plan map
• 1982 Poly Royal campus map
• 1991 (circa) map of Cal Poly
• 1999 map of Cal Poly in the 1999 course catalog

Additional maps of interest:

• Additional digitized maps via Facilities
• Historic land acquisition maps, by John Stechman

Note: If you are looking for a specific year that you do not find at the links above, you can also often find maps of campus in the course catalogs.

Image caption: 1999 campus map from the 1999 Course Catalog, pg 529. https://digitalcommons.calpoly.edu/catalogs/85/

Many aerial photographs of Cal Poly are digitized and available on the Kennedy Library Online Archives. 

Image caption: Aerial view of Cal Poly, looking north, circa 1940. https://digital.lib.calpoly.edu/ua-pho00000194

You can access many of the original architectural plans for campus buildings via the Facilities Web Plan Room: https://afd.calpoly.edu/facilities/campus-maps/web-plan-room (Cal Poly login required).

For projects that are not found at the above link (such as demolished buildings), University Archives may have the original print drawings.