And that number depends on you, your market, your property and your goals.

I'd be happy to visit about the market.  

The seller will also have to sign documents that are required and it will hold them liable for debts since they are on title.Best way to set that up is run the numbers and create a partnership based on the equity of the land and your cash injection and sweat equity.

Focus on market research by exploring neighborhood rent trends and property values while considering your financing strategy (house hacking, BRRRR, or buy and hold).

2) wouldn't the interest be taxable to seller?

The seller has the two lots legally separated, but due to deed restriction imposed by the subdivision development, found that building a house on the “tennis court” lot was not allowable. 

We do not raise it to market rents, we keep it at lease 10% below to try and reduce turnover.

I am an experienced investor and unexpectely find myself managing a duplex myself and wondering if there is a small landlord (aka inexpensive) simple solution for marketing, background checks and lease creation that markets on zillow? 

If they tenant is $300 below market, that's costing you $3,600 a year.

@Lucas DeAndrade how much knowledge do you think you've accumulated about the Akron market?