Four event staff will join the Business Design Centre's organising arm to ensure the two shows retain their "unique style".
BDC head of events Philip Lowery said: "The acquisition makes good strategic sense for us. With our resources and commitment we can ensure the long-term success and stability of the pair of shows."
Urban Interiors will now take place at the north London venue from 29-31 October while Urban Gardens will still go ahead from 6-9 May at Olympia.
The two events were transferred to phoenix company Legaro prior to the collapse of Redman Media last year (Event, October).