Looking for artist's statements? Consider searching relevant journals for the phrases "artists' statements," "artist statement," and "artist's statements".
Leonardo is a journal that has published many artist's statements. Search "artist statement" in quotation marks within its contents to find examples.
Some additional resources include:
How to write an artist statement
Artist Statements: A Quick Guide
If you want to expand your search to many more art, architecture, and design journals, search these phrases in online article databases that include article full text, such as:
Many biographical dictionaries that include living architects will feature not only articles by critics, but also statements submitted by the architects.