851.41. Notwithstanding any other provision of this Part, the amount of any expenditure that is a taxpayer’s tax shelter investment, the cost or capital cost of such tax shelter or the amount of any expenditure of a taxpayer an interest in which is a tax shelter investment, shall be reduced, where applicable, to the amount by which the amount of the taxpayer’s expenditure otherwise determined exceeds the aggregate of(a) any limited-recourse amount of the taxpayer and of any other taxpayer not dealing at arm’s length with the taxpayer that may reasonably be considered to relate to the expenditure;
(b) the taxpayer’s at-risk adjustment in respect of the expenditure; and
(c) each amount that is a limited-recourse amount, or an at-risk adjustment, that may reasonably be considered to relate to the expenditure and that is determined under this Title when this Title is applied to any other taxpayer who deals at arm’s length with and holds, directly or indirectly, an interest in the taxpayer.