DTI factors to look for when purchasing a duplex.

[Kerry Pangan]

I'm looking to purchase a duplex hopefully in the coming months. I've looked at my first property a couple weeks back and I really did like it. Unfortunately closing cost was higher than expected but my lender mentioned how it wouldn't have worked considering the property had really high property taxes and I guess would increase my DTI. I didn't know that would effect my DTI. What are other DTI factors should I look out when purchasing to satisfy lenders approval? I'm fairly new to all the terms. But as I looked at properties even though I wasn't close to closing on any of them I am learning as I go.