Keeping personal & rental expenses separate (How to fund rehab?)

[Eli Kallison]

Hi BP,

I am just realizing the importance of keeping business and personal accounts separate. My plan right now is to open a checking account and a credit card just for real estate expenses. I currently own 1 multi-unit rental property and some K1 syndicated investments, all of which are owned in my personal name.

I just purchased my rental property with funds from my personal checking account, and I have paid for about half of the rehab with funds from my personal checking account. 

My questions are:

1. Because I have no reserves in my "business" checking account, I can't pay for rehabs using this account. Are there issues with funding my business account with my personal account here? How should this be handled?
2. Should expenses related to investments for my syndicated and rental properties (like home office expenses, etc) be paid for through the business checking account?
3. How do you treat distributions from the business account to your personal account in terms of bookkeeping? 
4. Do you pay down payments from the business account for future property acquisitions?
5. Any other tips?

Thank you!