If I could deploy the same amount of up front cost to purchase an up and running portfolio.My calculations tell me that I can be cash flowing much more if I spend the money on a portfolio or complex.

Honestly looking at your situation I'm not sure I would recommend you do the taxes yourself,  change of accounting method (F 3115) isn't easy for someone that hadn't done them before these online software companies make things seem easier than what they are, they are good for less complex situations. 

This could cost around $500 to $1,500 per unit, depending on the size and complexity of the project.Certifications: There may be additional costs for certifications (such as HERS ratings) or third-party testing to verify the energy efficiency of each unit.For a 90-unit project, you could be looking at costs in the range of:$45,000 to $135,000 for energy modeling and certification (depending on the cost per unit).For a 112-unit project, the costs would likely be:$56,000 to $168,000 for similar services.Tax Credit Calculation:If you meet the energy standards, you can claim up to $2,000 per unit.

Consider Hiring a Legal Expert- German property law can be complex.

We've seen 3% for 100+ unit apartment complexes, but they also have onsite staff not included in the 3% management fee.Two other pricing options to properly understand:1) Fee charged based upon tenant payments or just occupancy.

For example, I was just at a networking event where the owner of a very experienced property management company shared a story about how he branded an apartment complex in Plant City, FL to The Henry Plant Apartments (or something to that effect). 

I have managed to get myself into a bit of a complex situation on my first deal and I'm looking for some advice. 

What adds complexity to our plan, is that we live in Minnesota.

I am a little weary since I haven't done that before- not sure it would be enough to get me into buying portfolios or larger complexes though.. 

Multifamily is incredibly complex and if you don't understand the metrics or calculations behind it, you're going to get burned. if you're just plugging numbers in until it "goes green", you are either going to miss out on deals or buy something you shouldn't.