Which head it is taxable in ?

Under which head is the rent income from commercial property taxable ??

is it income from house property ?? or income from other sources ?? 

Under house property , the act says any business carried on by the assesse himself  and the interest paid on the same should be taken as expenditure in  business BUT

doesnt it make difference if someone else does business at the same place ??

isnt there any difference between residential and commercial property ?? 

please someone clearify my doubt .

thank you !!