Are the following sentences correct?
a) Anyone would think he owns/owned the place, from the way he talks! (talking about the present)
b) Anyone would think he owned/had owned the place, from the way he talked! (talking about the past)
c) Anyone would've thought he owned the place, from the way he talked! (talking about the past)
For the meanings that I think you intend, my recommendation would be: Anyone would think he owned the place, from the way he talks! (present) Anyone would have thought he owned the place, from the way he talked! (past) You may also hear the other versions used, though note that "had owned" refers to ownership before the time of "he talked", which may not be the meaning that you are imagining.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
For the meanings that I think you intend, my recommendation would be:
Anyone would think he owned the place, from the way he talks! (present)
Anyone would have thought he owned the place, from the way he talked! (past)
You may also hear the other versions used, though note that "had owned" refers to ownership before the time of "he talked", which may not be