And the DTD hotels are I believe technically on Disney Property. (think it was a long-term lease deal for the land or something back when WDW first opened... one reason you haven't seen those buildings completely demolished and replaced with something more modern or a timeshare kinda deal since then).
Beyond that, the only places "inside the arches" are the Swalphin and the properties on the Bonnet Creek plot, The Wyndham Timeshare, Grand, Hilton, and Waldorf.
In a couple years, You may also have the option of the Four Seasons.