Since these are the rules regarding Single Family properties....how is this applicable to the OP's triplex?
If you read through the selling guide, although it is titled single family, it also covers Small Residential Income Property Appraisals (Form 1025), aka 2 - 4 unit single family properties.
It also covers Uniform Residential Appraisal Report (Form 1004), Manufactured Home Appraisal Report (Form 1004C), Individual Condo Unit Appraisal Report (Form 1073), as well as other property type appraisals.
Multifamily is like apartments units, 5+ or more.
From:
2007 Selling Guide
Part XI: Property and Appraisal Guidelines
XI, Chapter 4: Reviewing the Appraisal Report (11/01/05)
XI, 408: Income Approach to Value (11/01/05)
Title: XI, 408: Income Approach to Value (11/01/05)
The income approach to value is based on the assumption that market value is related to the market rent or income that a property can be expected to earn. Its use generally is appropriate in neighborhoods that consist of one-unit properties when there is a substantial rental market, and it can be an important approach in the valuation of two-unit to four-unit properties. However, it generally is not appropriate in areas that consist mostly of owner-occupied properties since adequate rental data generally does not exist for those areas. We will not accept an appraisal if the appraiser relies solely on the income approach to value as an indicator of market value.
To arrive at the indicated value by the income approach to value, the appraiser multiplies the total gross estimated monthly market rent for the subject property by a reconciled gross monthly rent multiplier. (Because of the way the appraiser’s opinion of value is derived under this approach, the income approach to value provides a reliable indication of value only when the comparable sales are truly comparable.)
• Estimated market rent is based on an analysis of comparable rentals in the neighborhood. After appropriate adjustments are made to the comparable properties, their adjusted (or indicated) values are reconciled to develop an estimated monthly market rent for the subject property.
• The gross rent multiplier is determined by dividing the sales prices of comparable properties that were rented at the time of sale by their monthly market rent, which is then reconciled to create a single gross rent multiplier (or a range of multipliers) for the subject property.
The appraiser must use his or her best judgment regarding the applicability of the income approach to value. An instance in which the income approach may not be an appropriate indicator of value involves the appraisal of a two-unit rental property in a neighborhood that is dominated by two-unit properties that are owner-occupied. In such cases, the appraiser does not need to develop a gross monthly rent multiplier, but must report the estimated market rent for the subject property. In such cases, the appraiser should provide an appropriate explanation of why he or she chose to report in this manner.
When the property being appraised is a one-unit property that will be used as an investment property, the appraiser must prepare a Single-Family Comparable Rent Schedule (Form 1007) in addition to the appropriate appraisal report form. [
This form is not required for a two-unit to four-unit property because the Small Residential Income Property Appraisal Report (Form 1025) provides substantially the same information, nor is it required for a Community Living group home mortgage.] When the appraiser is relying on the income approach to value, he or she should include the supporting comparable rental and sales data, and the calculations used to determine the gross rent multiplier in the appraisal report.