@Prince Martinez on the face it looks like a feasible deal.
1. How much time is left on the current leases? Will the current cashflow cover your expenses at the stated purchase price? If the tenants have long term leases you may not be able to increase rents until those leases expire.
You don't want to start off in the hole.
2. What will the cost of renovations be?
How long will it take you to recover that investment with the difference in rent? Let's say it's going to take you $7k to renovate a unit not including the carrying cost of having it vacant. On the unit currently renting for $500, when renovated the rent will be $900 so it'll take you almost 18 months to recoup the $7k investment. ($7k divided $400).
3. How did you verify your numbers? Did you check local listings for rent estimates? Talk w/ property managers?
Long story short let the numbers make the decision for you.
1. Plan for worst case scenario.
2. Ensure the cashflow covers your expenses.
3. Don't let the emotions lock you in. Walk the property with someone not tied to the deal, they may see something you don't. Trust me this saved me from buying a house that was about to fall down early in my journey.
Hope this helps