1933 28 79 Multiunit plants as a group unquestionably maintained operations on a relatively higher level than did independents.
1978 30 Mar. b6/2 (advt.) Calls outside the Primary Area, but within your local calling area, are referred to as Extended Area (or multi-unit) calls.
1995 (Nexis) 31 July 12 California Housing Finance Agency, multi-unit rental.