There are many state and federal plans available which allow you to take certain expenditures for home improvements off your taxes. These are primarily related to those expenditures which increase your home's energy-efficiency.
If you have any other questions, please feel free to contact me here on Trulia or at my website!
Without fear of reprisal, I can say;
Save every receipt you can, virtually everything related to that rental is deductible.
But, you really should talk to your Tax person!