Not sure what you mean by purchasing a 2nd mortgage. Do you need to add a 2nd to an existing property you own?
McAllister Homes Real Estate
Are you looking to purchase a 2nd property and keep your present one and rent it out? It is best to start with a conversion with one of San Diego's top Lenders to see what your options are. Once a Lender looks at your scenario, you will be able to determine all of your options! Below is a site with more info:
Feel free to call me if you would like to pick my brain at all: )
Windermere Real Estate SoCAL