My Friend as far as I know Income from Building is always chargeable u/h House Property except in case of inseparable composite rent and when let out is to carry on main business more efficiently.
Refer link https://law.incometaxindia.gov.in/DitTaxmann/IncomeTaxActs/2005ITAct/casesec22.htm
Specifically case laws :
1)
Even for real estate businessman income from property is ‘property income’ for period of ownership - If an assessee carries on business of purchasing and selling buildings, income received from the buildings so long as they are owned by the assessee will be shown under the head ‘Income from house property’ and not under the head ‘Profits and gains of business’ - CIT v. Chugandas & Co. [1965] 55 ITR 17 (SC).
2)
Section 22 applies not only to dwelling houses but also to buildings used for other purposes - The word ‘building’ is not confined in its scope only to dwelling houses. The word ‘house’ in association with other words also has many other meanings. But, a commercial building is not regarded as a house. That, however, would not take the income from such buildings out of the ambit of section 22. Though it is not clear from the context as to why the Act describes income from property as income from house property, the substantive provision of law which creates the charge and obligates the person who receives such income to have it assessed under that head does not confine its application only to house property, but extends it to all buildings whether such buildings are used as dwelling houses or for other purposes - CIT v. Chennai Properties & Investments Ltd. [2004] 136 Taxman 202 (Mad.).
Therefore in the first four cases assessee in not eligible to depreciation.
And for cases 5-8: Please substitute CAR for machinery and then answer because car has two rates whereas machinery(in general) has one rate. therfore machinery is not able to solve my query.

