Multiple service facilities can often save total cost for provision of service because of the economies of scale associated with facility size and the ability to share resources including land. In this paper, two multiple service facility location problems are formulated as minimization problems of the sum of travel cost and building cost of facilities. One assumes that the total number of facilities is given exogenously, and the other assumes that the total number of facilities is determined endogenously. Some numerical examples show that co-location of different type of facilities increases as land cost increases for the exogenous case. Similarly, co-location of facilities increases as land cost increases for the endogenous case while keeping the number of facilities large.
