Here in Texas, the biggest unpredictable for CAM is property taxes  (approx. 3% of market value) and while we protest using our consultants each year, the reality is that it can sometimes go up 2-3 times .

If you have multiple units in your building, you cannot limit Section 8 tenants to certain areas or floors of your building.If you are considering participating in Section 8, consult with an experienced landlord-tenant attorney to learn more about the requirements in your area.http://blogs.findlaw.com/law_and_life/2015/07/do-l...

(Style, Returns, All-In Price (Purchase + any repairs), Monthly Rent, School District)For the buyers my Team works with we conduct a detailed Needs Analysis consultation with every investor (1-2 hrs).  

What about a leasing consultant or residential concierge?

For more information on severance rules, consult a local attorney.

Consult with a Real Estate attorney or just have him pay you to break the lease!

If it a standard loan then you will need a GC and also a HUD consultant.

Consult a cpa....I am not one.  

Consult your tax professional. 

But I would recommend having one prepared.Items you want to consider are: what happens if your disagree on buying a property or on a aspect of a renovation or sales price, what happens if the project needs more money and one party can't or won't contribute, what happens if one party wants out mid-project, or one party makes a big decision without consulting the other party.