The determination as to whether a use is similar to uses permitted by right shall be considered as an expansion of the use regulations of the district and not as a variance applying to a particular situation. Any use found similar shall thereafter be included in the enumeration of uses permitted by right.
All applications for permits for a building or use not specifically listed in any of the permitted building or use classifications in any of the districts shall be submitted to the Zoning Administrator and the Law Director to determine compliance with the following standards:
(a) That such use is not listed in any other classification of permitted buildings or uses;
(b) That such use is more appropriate and conforms more to the basic characteristics of the classification to which it is to be added than to any other classification.
(c) That such use does not create dangers to health and safety and does not create offensive noise, vibration, dust, heat, smoke, odor, glare or other objectionable influences to an extent greater than that which normally results from other uses listed in the classification to which it is to be added; and
(d) That such a use does not create traffic to a greater extent than the other uses listed in the classification to which it is to be added.