Mr. Bridgman sent a letter to the mayor, noting there are classy designs for stand-alone, self-contained public toilets, and he suggests a vacant lot at [Higgins] and Main is a good site for one. The Bridgman letter includes a suggestion of a multi-toilet structure that houses toilets similar to the porta-potties used at outdoor public events. But there is a variety of designs and distributors to choose from, including the elegant-looking, privately operated units that grace the sidewalks of Paris, New York and Vancouver. They can be coin- or token-operated and have a time-limited use, which can dissuade people from abusing or misusing them as places for sex, shooting up or sleeping. Automated, they are sanitized between uses and serviced by the manufacturer under contract.