Deductions that flow to personal income

[Armand Farr]

Hey guys - I work full time and I'm looking at buying my first rental, holding it within an LLC.

I know investment property mortgage interest can be a deduction against my personal income (even if the property isn't cashflowing, right?). But are there any other deductions that flow to my personal income?

IE: If I have office expenses, can I deduct them from my personal W-2 and lower my effective tax rate? Or will it only get applied to the profits of the property?