Purchase price: $220,000 Cash invested: $30,000Currently house hacking.

I was involved in two small infill developments in Michigan (about 15 houses in total) so two very small parcels. 

If the other two parties want to flip a house maybe they can do just that as partners and then sell you the house which you can buy with a primary home loan with low down payment.

My goals are to start building an investment portfolio of professionally managed (I could tell you all the reasons I will not do it myself) multi-family properties and, in time, develop a property in the Northwoods (Wisconsin/UP).

Quote from @Andrea Lucarelli: I’m interested in beginning my REI career with purchasing a SFH or condo in Cleveland area (safe neighborhood) to list as a furnished rental for travel medical professionals, supply corporate housing needs, or house temporarily displaced families for insurance companies.  

Once you start hiring employees, it's smart to develop it out so you can train them properly and so there is a documented reference guide.

How would you have preferred Sunrise to have developed at relationship with the residents?

If you treat the renter (resident) well, provide a well-kept home that you service regularly, and stay on top of any maintenance issues, a resident will likely remain in the house for many years. 

I bought 14 houses basically for free by harvesting the equity in my houses by doing 5 cash out refis.

Have another self storage development identified.