The city shall provide for the collection of recyclable material under such terms and conditions as the city may from time to time deem appropriate. A curbside program is imposed for each single-family dwellings (attached and detached), each two-family dwelling, each three-family dwelling, each townhouse and each condominium. Multi-unit dwellings may exercise the option to contract or otherwise obtain sanitation services from the city. Common interest communities and all other residential dwellings must provide recycling service to each dwelling unit.