Deductions & credits

LLC had a profitable year. I was renting in SC so I will deduct that payment from the LLC taxes.

I am using part of my home as an office in NY. How do I claim the partial depreciation and partial expenses (RE tax, mortgage interest)? In my personal tax return or the LLC's return?   

One last question, Do I have to file a State Tax Return for NY or SC or Both? How do I apportion between the

2 if filing in both states?