The 1007 form used in the appraisal is for a comparison of other rental properties for the purpose of determining the market rent of the subject within the subject's market area.  This can be used to determine the GRM or (gross rent multiple) a common denominator used to determine market rent of a given market area.  The 216 form or operating income statement then takes the market rental amount for the year and subtracts the costs of long term and short term life expectancy items along with services provided for an income to cost analysis.  These forms are often needed for residential income producing investment properties.  However, a comparison of rental properties is already included in the 1025 form needed for small residential properties like duplexes, triplexes and quadraplexes.