Class A apartments have numerous amenities, professional management, and sit in desirable neighborhoods.

These tax deductions do not require you to become a real estate professional.

Similarly, if you put several Class D tenants in a Class A 4-plex, what do you think will happen to the property?

Am interested in a copy of a professional log book as well...thank you...

Everyone has said, "go talk to a professional," because that’s the only real advice any professional on BP can give. 

California does not recognize Real Estate Professional (REP) status, but you can still claim it on your federal taxes if you qualify.

And how many classes are there? 

@Polat CaglayanI've never seen a formula but here is a general rule of thumb for multifamily:The class of an apartment refers to the quality of the building, which can be determined by a number of factors, including age, location, and condition: Class A: These are the highest quality apartments, typically built within the last 15 years.

I would like to start connecting with lenders, attorneys, realtors, title companies, and all other professional in the SATX commercial real estate market.  

Any recommendations on the most efficient way to track your time when classified as a real estate professional?