Show I Structures Structure's Probable Life Lile Determination of the average overage useful use Ut ful fun life lite practically to be expected for buildings building of or every principal type Is the purpose of an cot l hl Investigation being made by the National onal Association of Ideal Iteal I tote Boards The work Is being carried on 00 at the request of or the Ihl United States Stales bureau of or Internal revenue The bureau Is III seeking eking thus to to obtain data dato which t nay lilY be u used tI in determining the rules ruleR to be lie followed In computing the depreciation depredation de de- de- de predation and obsolescence ob of real estate Improvement as all allowed onder un on under der er the Income tax law |