Best way to leverage paid off properties

[Mike Margetts]

Hi,

I've been buying and holding my rentals for 6 years now (mostly duplexes) and have poured money into paying them down and off.  Currently have 4 out of my 8 paid off.  I want to purchase more and maybe get into something bigger like 4 plexes.   My question is how best to leverage my props?  I don't have much saved up for a down because I've been throwing cash at the mortgages.  Any advice?