So much of the stock of a tenant-stockholder in a cooperative housing corporation as is allocable, under regulations prescribed by the Secretary, to a proprietary lease or right of tenancy in property subject to the allowance for depreciation under section
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(a) shall, to the extent such proprietary lease or right of tenancy is used by such tenant-stockholder in a trade or business or for the production of income, be treated as property subject to the allowance for depreciation under section
167
(a). The preceding sentence shall not be construed to limit or deny a deduction for depreciation under section
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(a) by a cooperative housing corporation with respect to property owned by such a corporation and leased to tenant-stockholders.