I come from seeing a few folks floating the idea that the Episcopal Church is "decentralized." I would say that on the contrary it is unitary, as no diocese can be created without national approval; nor can bishops be elected without national church approval, just for starters. All dioceses are required to give unqualified accession to the national Constitution and Canons. Between meetings of the General Convention, the church is managed by a national Executive Council. Where is this alleged "decentralization"? (Please note, I use "national" here for convenience: there are a number of "international" dioceses part of the Episcopal Church -- and they have say too, equally with those in the US.)
This structural reality also has bearing on the property question concerning dioceses that attempt to leave The Episcopal Church. "Who gets the property" is amply answered by the wording of the relevant canon: (I.7.4)
All real and personal property held by of for the benefit of any Parish, Mission or Congregegation is held in trust for this Church and the Diocese thereof in which such Parish, Mission or Congregation is located.If a "diocese" were to assert it is no longer "of this Church" it would forfeit the property under this canon, since the property is held for this Church and the Diocese thereof. So when a diocese "leaves" (if it could) or simply is dissolved (as is more likely) the property reverts to "this Church" -- that is, The Episcopal Church, governed since 1789 by the Constitution and Canons of General Convention.