Find 315 flexible and convenient short-term apartments for rent in Walnut Creek. To legally operate a short-term rental in Contra Costa County, property owners must obtain a STR permit from the Department of Conservation and Development.Pay their portion of rent on time and otherwise in accordance with the terms of the lease. • Comply with the terms of their lease with the landlord. Find 128 flexible and convenient short-term apartments for rent in Martinez. Hosted shortterm rental may not be rented for more than 90 days in any calendar year. 12 allowing the shortterm rental of residential dwelling units in the unincorporated areas of the County. Fill out the application to see if you qualify. Find 127 flexible and convenient short-term apartments for rent in Martinez. All students placed in a homestay must agree to the terms of the Housing Policy.