Originally Posted by lost_in_translation

IHG increasingly do it - Crowne Plaza/HIX at LHR T4, Manchester Crowne Plaza/Staybridge Suites, etc.

Can't name an RC/Marriott joint development off the top of my head but there are quite a few places where e.g. an RC is next to a JWM such as Orlando and LA, so surely a Sheraton / Westin or Sheraton / Four Points could work.