As per well settled legal position about how to see and read any judgement of Courts, which is explained by me in earlier post at Sr. No. 26 above, it is clear that remarks / observations made in various quoted SC rulings (about relationship between lift / elevators with building) has got no application what-so-ever on subject legal controversy under discussion here.
As quoted AAR / AAPR wrongly applied remarks made in those SC rulings, quoted AAA / AAAR (favoring revenue) has got lost even their persuasive values.
Now, to take this discussion forwards, let us take at the issue with fresh eyes:
A. Clause (c) & (d) of Section 17(5) specifically includes 'Plant & Machinery' (P&M) while blocking ITC.
B. P&M is explained below Section 17(6) as follows:
"Explanation.–– For the purposes of this Chapter and Chapter VI, the expression “plant and machinery” means apparatus, equipment, and machinery fixed to earth by foundation or structural support that are used for making outward supply of goods or services or both and includes such foundation and structural supports but excludes-
(i) land, building or any other civil structures;
(ii) telecommunication towers; and
(iii) pipelines laid outside the factory premises."
B1. What is excluded from P&M is 'building or any other civil structures' and NOT 'building or any civil structures'. Thus, for purpose of exclusion of ITC under clause (c) & (d) of Section 17(5), building is specifically made equivalent to 'a civil structure' & nothing beyond. Lift / Elevators are NOT be called as 'Civil Structure' under common parlance.
B2. Without prejudice to above, Lift can be called as 'permanent fixture of building'. But calling it 'permanent fixture of building' itself means it is otherwise 'separately identifiable immovable property' from 'a civil structure of building'. And, separately identifiable immovable property (i.e. Lifts / elevators) fits perfectly into the explanation defining P&M for taking ITC even if it excludes 'buildings'.
B2.1 'Fixture' is defined in Oxford Language as follows: a piece of equipment or furniture which is fixed in position in a building or vehicle
B3. Thus, what is excluded from P&M is 'Civil structure of Building' and NOT P&M (i.e. Lift / Elevators' which is installed / erected in such buildings.
Summarizing above, I see not any reason why ITC against such lift / elevators cannot be claimed by a tax-payer in subject situation given by the querist. Exclusion from ITC under Clause (c) & (d) of Section 17(5) does not apply in given situation in my view.
These are ex facie views of mine and the same should not be construed as professional advice / suggestion or recommendation.