I have a business selling items on their and it can be a pain sometimes 

The technical requirement is that you have the intent to hold the property for rental, investment or use in a trade or business.

The negatives:Unfortunately, outside of Acquisitions and rehabs, the management, tenant placement, and collections side of the business is terrible.

I don't have a W2 and all I have is the first duplex income and some photography income from my photo business.

You could do this for anyone in the real estate business.

TaxesCash flow is controversial: your business needs cash flow to survive, but the source does not matter, could be your W2 if you have one.

Also bear in mind @Limor Hanannia that if the IRS thinks you're running a business within your SDIRA or Solo 401k you will be taxed on UBIT for that as well which scales up to 37% so it can be quite hefty. 

I have been a General Contractor in the San Antonio area for the last 16 years and now looking to grow in this new face of business.

Hey Richard, We operate a few small business in the Real Estate Investing space hear in columbus from Acquisitions and General Contracting through to the sales department and Custom Construction.

How good is your business plan.