All personal assets (property, investments even advances given) as and when the transaction is done, should be duly disclosed in the BS of a proprietor. This is helpful in case a query comes about the source of such investment.
No depreciation will be claimed on the non business assets. Also no deduction for interest will be claimed on loans taken for purchase of non business assets.
If the proprietor chooses to keep the personal assets away from balancesheet, atleast he should keep a working ready about the source of such assets(eg, gift/loan/drawings)