COMMERCIAL PROPERTIES INFORMATION REQUIREMENTS The income approach to establishing the market value of business properties (commercial, industrial and/or apartment buildings) must be supported by good, reliable documented data such as: Two years of income and expense statements of sufficient detail to enable separation of expenses by category and those paid by tenants. A tenant roster and spread sheet for the past two years which indicates for each tenant square footage rented, base rental amount, percentage rents (for retail tenants), date lease began, renewal date, and tenant contributions to expenses. Copies of gross sales reports by tenants in retail type occupancies. Conditions which may cause the subject to be atypical should also be identified. The generally accepted cost approach is from the Marshall-Swift Manual. Documented actual construction costs would be considered for new construction. Updated: 09/17/2002