B should have standing from the park designation creating a public easement. I'm guessing the deed restrictions are pretty thin, and that pages++ of legalese would have done a better job. But this is the exact dynamic that everyone (rightly) hates attorneys for, both on the giving side ($$$ to hire an attorney to copypasta all that crap), as well as on the receiving side (pages of legalese are bound to create a bunch of extra facets to be dealt with by both the city and residents). Rather than the same rough type of structure needing to be reinvented over and over out of common law cloth, we really need reform aimed at defining commonly understood constructs that can simply be instantiated by reference.