What Questions Should I Ask The Lender When Refinancing

[Howard Montaque]

So my mortgage lender noticed I ordered my payoff on my duplex I bought 3 years ago. I was considering selling or refi. After reading a lot and watching podcasts I understand holding is the way. The lender told me that they want to keep my business and can give me 3.75% APR and beat any other offer as well as give me 100% appraised value for refi. So what other questions should I ask before pulling the trigger? This will fund my charge into BRRRR.