Most books on 20th & 21st century architecture and architects have floor plans and drawings of completed works and projects. Use LibrarySearch to locate books on the architect, building or project and include the keyword "plans" (see below)
Example 1: Le Corbusier plans
Example 2: Herzog & de Meuron plans
Example 3: Federation Square plans
Example 4: Farnsworth House plans
South African Bureau of Standards
SABS is a statutory body that was established in terms of the Standards Act, 1945 (Act No. 24 of 1945) and continues to operate in terms of the latest edition of the Standards Act, 2008 (Act No. 29 of 2008) as the national institution for the promotion and maintenance of standardization and quality in connection with commodities and the rendering of services.
These books contain floor plans, illustrations, photos and text relating to exemplar buildings from around the world.
The Phaidon atlas of 21st century world The Phaidon Atlas of Contemporary World Architecture