Tom:
Absolutely, that would be along the lines of the minimum for a single corridor hole between real estate.
I must confess to having designed in a few 160 metre wide single hole corridors on one project, just so I could get some strategic variety into the design. The developer didn't know any better! 120 metres (130 yards) limits what you can do with the strategy, as you don't have much room to create strong angles of play/offset fairways.
I'm not going to preach to my American friends about this. Just looking at an aerial of Palm Springs tells me that you have far more experience of how tight things can be than I have.