• Martina, Inc. has two service departments (Human Resources and Building Maintenance) and two production departments (Machining and Assembly). The company allocates Building Maintenance cost on the basis of square footage and believes that Building Maintenance provides more service than Human Resources. The square footage occupied by each department follows.

  Human Resources 6,000

  Building Maintenance 13,000

  Machining 18,000

  Assembly 26,000

  Assuming use of the step-down method, over how many square feet would the Building Maintenance cost be allocated (i.e., spread)?