Section 1.109-1 - Exclusion from gross income of lessor of real property of value of improvements erected by lessee(a) Income derived by a lessor of real property upon the termination, through forfeiture or otherwise, of the lease of such property and attributable to buildings erected or other improvements made by the lessee upon the leased property is excluded from gross income. However, where the facts disclose that such buildings or improvements represent in whole or in part a liquidation in kind of lease rentals, the exclusion from gross income shall not apply to the extent that such buildings or improvements represent such liquidation. The exclusion applies only with respect to the income realized by the lessor upon the termination of the lease and has no application to income, if any, in the form of rent, which may be derived by a lessor during the period of the lease and attributable to buildings erected or other improvements made by the lessee. It has no application to income which may be realized by the lessor upon the termination of the lease but not attributable to the value of such buildings or improvements. Neither does it apply to income derived by the lessor subsequent to the termination of the lease incident to the ownership of such buildings or improvements.(b) The provisions of this section may be illustrated by the following example: Example. The A Corporation leased in 1945 for a period of 50 years unimproved real property to the B Corporation under a lease providing that the B Corporation erect on the leased premises an office building costing $500,000, in addition to paying the A Corporation a lease rental of $10,000 per annum beginning on the date of completion of the improvements, the sum of $100,000 being placed in escrow for the payment of the rental. The building was completed on January 1, 1950. The lease provided that all improvements made by the lessee on the leased property would become the absolute property of the A Corporation on the termination of the lease by forfeiture or otherwise and that the lessor would become entitled on such termination to the remainder of the sum, if any, remaining in the escrow fund. The B Corporation forfeited its lease on January 1, 1955, when the improvements had a value of $100,000. Under the provisions of section 109, the $100,000 is excluded from gross income. The amount of $50,000 representing the remainder in the escrow fund is forfeited to the A Corporation and is included in the gross income of that taxpayer. As to the basis of the property in the hands of the A Corporation, see § 1.1019-1 .