Oh yeah the two dudes in the house next Marlowes don't say anything useful and there is no dialogue option on the bartender to ask him about them. I am truly stumped!!!

Well, hell. You got bugs galore. Kill the 2 folks living on the heights and they should drop a key. If they don't, just Ctrl-J over the wall and raise your mighty middle fingers in anger against Foulcode, the god of computer bugs.