If you can't get approved through a standard lender try seeking portfolio lenders or small local banks that keep their loans in house and can be more flexible with their lending standards. 

I'm on your side here man, and don't want you to fell sh*t on for not having fit some arbitrary standard of 'investment'.BUT...   

Been looking into using an FHA loan, either standard or 203k, to purchase my first multifamily property.

Of course the answer is greed but it taints everybody when the big boys don't have any standards either.

Solera National Bank has dedicated team/department working with IRA clients, they have superior online system and mobile app with standard mobile deposit up to $50,000 (you can request higher limit if needed), their checking account has no fees, they give you free checks and more.

They are almost always grandfathered in as they were compliant with building standards when they were constructed.

If you're flipping the property I'd demo and rebuild the floor to modern standards with new materials. 

It is not a co-op, just a standard condo in the suburbs.  

(Selling stocks and want to avoid long-term capital gains.)Maxing out the 401k is $18,500, standard deduction is $24,000. 

Interest is generally deductible.