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Hypothetically if I win a bid, then would I be able to utilize a HML for any possible repairs now that they'd have access to inside the property?

Why would you give them free rent with they still have full access and use to the stove, refrigerator, walls, closets, flooring, roof, garage, lawn, etc.?

The two units are currently accessible to each other by doors.

Then after your exchange you could do a cash out refi or a lower rate as well as access some cash for a rainy day. 

Each loan product type has different rules and restrictions for using rental income to qualify for new purchase, and some can wreck your plans (such as the FHA 100-mile rule).

Work with a broker who has access to a large variety is going to help you find an appropriate option for your situation vs a direct lender who can only sell you their limited product set. 

It's not that they didn't have access to the info that told them to save their money, it's that they ignored it. 

Is it clear access or hard to get to?  

Today they sent over the listing agreement, but won't have interior access until the 26th of this month.