The attorney did acknowledge that this can be done but his reservation is that this "causes issues" (I am still ascertaining what those issues are). 

I'd say find a local landlord in that area who self-manages to confirm what the process is, as certain states (ex: MA,NY) can be very, very particular.   

If anyone has a ballpark figure, or can point me in the direction of where I might ascertain this information, I'd be very appreciative.

Puzzled, we've tried to even ascertain if the name was male or female which could help in narrowing down family member.

I'm not as certain.

I expect some interesting and possibly good deals to percolate later in the year, as certain sellers will be forced to liquidate.

I would certainly do a comp on condos of similar size and room count as what you have in mind for your building to ascertain if it will even be economically sound to do the condo conversion.I would start with a search word here on the internet for the city your building is in.

Much of the info they give can be ascertained for free but it takes time and work to gather that info.

Now, the current lease is expiring and we need to raise the rent closer to market rates.We are not using a broker for this transaction so we don't have someone with real-time access to the market rates.Are there any free resources for mom/pop CRE owners that can help me ascertain current market lease rates and CAM charges?

It's not your problem to ascertain whether or not the people using the beds are adults or children - more than 4 beds, there are clearly more than 4 occupants, in violation of the lease.