can I apply for a second mortgage if I already have a modification on the first mortgage?

Much more info needed to address your specific scenario.. We would need to know about the details of your existing loan, specifically the modification agreement.. and how long ago the modification took place.. then you might be able to do a "cash out" refinance.. It's highly unlikely any lender would allow a 2nd mortgage behind a modified first mortgage.. I'm a Broker here in Scottsdale AZ and I only lend in Arizona. If you or someone you know is looking for financing options, feel free to contact me or pass along my information. William J. Acres, Lender411's number ONE lender in Arizona. 480-287-5714 WilliamAcres.com NMLS# 226347