43-301 - Required yards along district boundary coincident with side lot line of zoning lot in an R1, R2, R3, R4 or R5 District LAST AMENDED 12/15/1961 M1 M2 M3 In all districts, as indicated, along such portion of the boundary of a #Manufacturing District# which coincides with a #side lot line# of a #zoning lot# in an R1, R2, R3, R4 or R5 District, an open area not higher than #curb level# and at least 15 feet wide shall be provided within the #Manufacturing District#. Such an open area shall not be used for #accessory# off-street parking, #accessory# off-street loading, or for storage or processing of any kind.