In order to determine the monthly street light utility charge, the total street light costs for the prior calendar year is divided by the number of utility accounts billed by the City. Unless otherwise billed by individual units, multiple unit dwellings will be competed and billed by the aggregation of each of the single-family equivalents. For example, a four-unit apartment building which is billed a single billing for the entire dwelling would be billed at the sum of four separate units. Therefore, the monthly bill would be $7.72 (4 x $1.93 a month/unit).r separate units. Therefore, the monthly bill would be $7.72 (4 x $1.93 a month/unit).