ALL premises on Soi 4 are on annual leases (payable to 'the family', and always have been.
'Key money' is paid once a year at New Year. It has nothing to do with lease, rent or additional 'side payments'.
Last year, PRIDE itself was offered for sale to include all floors including the 3rd (U.S.) floor which the present owner used for his financial businesses. He has now moved this to Park Silom.
Original ad, last year, later withdrawn:-
(Strange because this link states " NOTE: Sale does not include Circus Bar and Restaurant. ")
Last year:-
BUT latest is this:-
Owning a bar in Thailand is a serious undertaking to be done by people familiar with Thai business practices in particular the licensing trade.
Many practices here can be an anathema to those brought up in more 'organised' societies'. You are not going to change them, it is their country!
When I first moved here 25+ years ago, I bought a book called something like 'Doing business in Thailand as a foreigner'. No idea if it is still published.
If you still want to go ahead, try chatting to owners of SUCESSFUL bars. Then approach. Cameron with serious enquiries rather than occasional visitors who think it would be a nice idea.
And finally, get a Thai manager familiar with the scene who you would trust with your life. (and a similar Thai lawyer.).