“6. The Transferees to the intent and so as to bind the Property and each and every part thereof into whosever hands the same may come and in order to benefit the Retained Land and each and every part thereof hereby covenant with the Transferor that the Transferees and the persons deriving title under them will at all times hereafter observe and perform the following covenants: … (e) not to use Barn 3 other than as a private dwellinghouse in one residential occupation with garage and outbuildings to be used only in connection with the said private dwellinghouse