FHA loans have strict criteria and limits on the condition. 

My dad and I fixed it up over the last two years, and it has passed all its inspections and meets the code requirements for me to get a renter in there.

If the agent isn't responding to your agent then he's likely breaking the Realtor code of Ethics, and Bright MLS rules, requiring clear cooperation.

The tax code is so complex that no accountant can understand every aspect of the tax code. 

Yes, will be strictly an investment property.

You are also venturing into areas of building codes and zoning codes that could put a damper on your plans.

I don't think the PO cares, just your tenants.If you can do this then you should be under cover and fine unless you have a real aggressive building code enforcement or someone complains about something.I know of an effort in Savannah to make a duplex like this to code. 

You will own a property that has these risks and 100 more:car falls on leg of customer and he is young and incapacitated and sues you tootenant pours poisonous degreaser into public plumbing an it leaks 200 feet to neighbor properties, they sue yourobbery happens and child is trapped in the bay and survives, the parents sue youteen comes in with their helper dog who bites clients, they sue youfireman falls through the roof in a fire (chemical fire) and is disabled because the roof wasn't to code...Although you are only the landlord you have duties to health and safety of the employees, clients who walk in, and the community.Look up: Ng to the Ghost Ship landlord in East Oakland

Once you start new builds, you are going to be bleeding a lot of money the whole time till you sell, and you have to hop through all kinds of hoops with the city for code and they are the opposite of fast no matter where you live.

Be sure to check updates on codes you might have to retrofit and some point.