Consider getting contractor bids during your inspection period to have more accurate numbers.3.

I’m using funds from a 1031 exchange for the deposit.Can anyone provide insights or guide me on how to refine my underwriting or ask the right questions to ensure my numbers are accurate and this is a solid deal?

We don’t have any data to better understand your dilemma… which makes giving accurate advice more difficult.  

I just setup a phone number to track my letter responses last month so I should have more accurate response rates in a few months.

Some lending programs are more or less (there are various programs) but in general 50% DTI is max.In order to ensure you accurately plan for your future mortgage its good to know up front how these situations would be affected and what borrowing power you will need when the come times to purchase this upcoming "condo."

@Ankush R.Recommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

I generally let tenants know that if they want it, there are services they can pay for, where they put the data in, and then I get sent an email just confirming the data is accurate. 

This will help you estimate revenue more accurately.

They can provide a more accurate assessment and potential repair costs.When dealing with homes from the early 1900s, it's prudent to overestimate your renovation budget to account for unexpected issues.

The other thing I would say is to double check all of the figures on the CD to make sure they are accurate.