Example. On July 1, 1954, the X Corporation, which makes its income tax returns on the calendar year basis, purchases an emergency facility, consisting of land with a building thereon, at a cost of $306,000 of which $60,000 is allocable to the land and $246,000 to the building. The certificate covers the entire acquisition. The corporation elects to take amortization deductions with respect to the facility and to begin the 60-month amortization period with the taxable year 1955. Depreciation of the building in the amount of $6,000 is deducted and allowed for the taxable year 1954. On March 25, 1956, the corporation files notice with the district director of its election to discontinue the amortization deductions beginning with the month of April 1956. The adjusted basis of the facility on January 31, 1955, is $300,000, or the cost of the facility ($306,000) less the depreciation allowed for 1954 ($6,000). The amortization deductions for the taxable year 1955 and the months of January, February, and March 1956, amount to $75,000, or $5,000 per month for 15 months. Since, at the beginning of the amortization period (January 1, 1955), the adjusted basis of the land ($60,000) is one-fifth of the adjusted basis of the entire facility ($300,000) and since there are no adjustments to basis other than on account of amortization during the period, the adjusted basis of the land should be reduced by $15,000, or one-fifth of the entire amortization deduction, and the adjusted basis of the building should be reduced by $60,000, or four-fifths of the entire amortization deduction. Accordingly, the adjusted basis of the facility as of April 1, 1956, is $225,000, of which $180,000 is allocable to the building for the purpose of depreciation deductions under section 167, and $45,000 is allocable to the land.