Purchasing a MF for the first time!

[Sam Kubwimana]

I got a preapproval of $700K using rental income and 3.5% downpayment for buying a MulitFamily. Even if this is exciting, I am scared I may make a bad choice. This will be the first time buying a home. I have been reading some posts here about purchasing a MF. But if someone has some extra information and advice, I'd be happy to hear from you. 

My dream is to purchase a MF (3 units would be good), that has big lot so that some day you can add a unit in future to add value. But I live in Boston MA, which is highly competitive and houses here are very old. I was thinking going outside of Boston MA and find some cheaper but yet good cash flow MFs. Currently, I am working with one realtor. she is excited to find this house too! we have two months before the preapproval expires... 

PLEASE if you have gone through this or you have an advice to give, please don't hesitate to speak your mind. 

Thank you in advance for your time.