information about how to tap into my equity again

[Satima Flaherty]

I bought a house in Oakland in 2007. I refinanced my house last year and pulled money from the equity. I purchased another property with the cash out. I have a substantial amount of equity remaining. I want to tap into my equity again to purchase a multifamily unit, but I don't want the house with sufficient amount of equity to become an upside down mortgage. Any suggestions?