I'm starting this thread out of curiosity more than anything else because it doesn't have much financial relevance to me (as someone who is not an institutional investor).

I'lll kick things off by providing a few examples I know about, off hand (all in Asia, for better or for worse, but I assume this a global thing).

Conrad // SL Hong Kong (two, identical from the outside, towers in the same complex)
GH .// Ren HK (I think they actually are in a single building, but have separate entrances; they share the pool)
Le Meriden // Hilton Kuala Lumpur (same building and lobby; there's basically an invisible line running down the middle of the lobby)
JW // RC Beijing China Central Place (different sized buildings about 250 meters apart)
Hyatt Place // Hyatt House Shenzhen Airport (from the outside, the two buildings look identical)

Questions/comments:
-More examples are welcome
-Can I assume that most of these places have the same owner (per location)?
-If so, does the benefit of brand diversification offset the cost of dealing with multiple management companies? (I have some guesses on this point, but I'll hold them back until further comments come in)
-the hotel within a hotel concept (e.g. high floors are a sub brand) seems like a different case to me, but how is this better/worse than simply selling high floors as club level?