Situation 1 : If he has let out 'residential house' for business. Later tenant doing business, not owner himself..owner has just let out residential house for tenant's business purpose so in the hands of owner : whether he let out for 300 days or more criteria should be seen.
Situation 2: let out of house of commercial establishment then it is not taxable since it is not an asset u/s 2(ea).
Hope it clarified.
Specificaly its nt mentioned the list of included or excluded in C.E. It should be seen from the view of whether business is carried on or not. For instance factory, godown, complex leased out on rent are excluded u/s 2(ea).