rents from real property
(4)Where a real estate investment trust receives or accrues, with respect to real or personal property, any amount which would be excluded from the term “rents from real property” solely because the tenant of the real estate investment trust receives or accrues, directly or indirectly, from subtenants any amount the determination of which depends in whole or in part on the income or profits derived by any person from such property, only a proportionate part (determined pursuant to regulations prescribed by the Secretary) of the amount received or accrued by the real estate investment trust from that tenant will be excluded from the term “rents from real property”.