My boss describes himself as a "well-informed architectural hobbyist". He is setting off on a trip to New York City, London and Paris - cities he has visited several times before and seen the main sites. He is keen to find a tour, or a guide (maybe you are a student architect who needs some extra cash), who can show him places he may not be aware of as they may not appear in the usual tourist guides. He is most interested in Paris and New York(and yes, I have noted the previous threads on this topic).