(1) Subject to subsections (2) to (5), where a relevant residential property has been adapted for the purposes of rendering it more suitable for the accommodation of a person who has a disability (within the meaning of section 2 of the Disability Act 2005), section 16(1) shall apply as if the reference in that provision to the chargeable value of a property were a reference to the chargeable value of the property as reduced by €50,000.
(2) Subsection (1) shall not apply unless -
(a) either -
(i) a grant in respect of the cost of the work referred to in subsection (1) was paid under either -
(I) the Housing (Adaptation Grants for Older People and People with a Disability) Regulations 2007 (S.I. No. 670 of 2007), or
(II) Regulation 4 of the Housing (Disabled Persons and Essential Repairs Grants) Regulations 2001 (S.I. No. 607 of 2001),
or
(ii) a grant referred to in subparagraph (i) was not paid and the Revenue Commissioners confirm in writing, under subsection (4A), the reduction in t
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