A minimum of 25% of the uses in a mixed retail commercial and office development shall be uses otherwise permitted in the HC Zone. The remaining uses may be stores for convenience goods, personal services and similar retail uses and professional offices. General, administrative, medical offices and other professional offices shall be permitted in independent structures under conditions outlined in the parking requirements section of this chapter. Other medical and quasi-medical uses such as opticians, medical supply, pharmacies, etc., not including general medical practitioners and dentists, shall be permitted in mixed-use centers. Laundromats are prohibited, unless public sewer is provided. Individual community septic systems shall not be construed to be public sewers for the purposes of this chapter. Photo-processing, printing, furniture stripping and refinishing, manufacturing, automobile painting and dry-cleaning processing uses shall be prohibited. Dry-cleaning establishments where items are dropped off for processing at another location are permitted.