Subject to conformance with the performance standards specified in Section 17.44.100, the following principal uses are permitted in an M-1 district:

    A.    Any manufacturing, processing, assembling, research, wholesale, storage or utility use, when conducted within an enclosed building, except those uses which are specifically listed and otherwise regulated in Section 17.44.040 and in Section 17.46.030;

    B.    Parking lot. (Prior gen. code § 8-51.2)