Not a specialized niche or technique that worked for one person.

Give @Linda Weygant a call, or one of the other CPAs that specialize in RE.

May I ask what your speciality is in accounting ?

You might consider Niche or Specialized Housing like student housing.

THIS IS A VERY TRICKLY PROCESS AND THEY REJECT MORE THAN 50% OF W-7 AND THEY HAVE TO BE REFILED....according to my CPA.The tax preparer will need to do a paper filing of the PARTNERSHIP INCOME tax return and it will also be sent to a special unit at the IRS with the investors completed W-7.

You might consider Niche or Specialized Housing like student housing.

Can you serve niche tenants, like some organization, that reduces vacancies or pays premium rents for special amenities or location?  

You might consider Niche or Specialized Housing like student or medical housing.

If your lender or attorney wants special add on packages the seller generally makes the buyer pay for those.  

Ask for Mary Martinez, she specializes in investor transactions.