Investment finance cash or loan?

[Alecia S.]

   I am new to real estate investing. I bought my first rental with all cash for 121000 and rehabbed it to be worth 160000. I currently rent it out for 1395 a month. 

   I am buying my second rental closing on Monday with a 25 percent down payment and a 30 year mortgage. 

   When I am ready to buy my next one I was wondering if I should borrow against the first property for a down payment. I am not well schooled in the financial world and was wondering if this would be a good option to increase net worth and decrease taxes.

Looking for advice. Thank you.