Gordon Matta-Clark is such a fascinating figure, but I think there might be a bit of confusion here—he’s primarily known as a conceptual artist and architect, not a novelist. His work with 'building cuts' and urban interventions like 'Splitting' is legendary in art circles, but I’ve never come across any written fiction by him. If you’re looking for free resources about his life or theories, sites like Monoskop or archive.org sometimes host rare art texts, but you’d likely find more essays or documentaries than novels.
That said, if you’re into his experimental approach, you might enjoy digging into related zines or artist writings from the 70s. The overlap between avant-garde art and literature is huge—think of Kathy Acker or William Burroughs. Maybe that’s where the novel idea came from? Either way, his actual artworks are worth diving into if you haven’t already—they’re mind-bending in the best way.