I would check with one of the several asset protection law firms on here that cater to REI's.  

Choose the right firm with the right tools and business model. 

I know my firm helps bc you can get a transaction coordinator for 250 a deal. 

The numbers didn’t work for me to offer any higher so I stood firm on my original offer.

Choose the right firm with the right tools and make it happen! 

But one of the units is so large (used for small/medium sized law firm) I wanted to break it up in hopes of having better success renting it out quick.

A few red flags include:- Poor communication (there have been firms I've contacted, left voicemails and emails and it look them weeks to get back to me.

It also depends on what else is the competition in the area, whether adding the second bath just catches you up with them, or puts you ahead of most of the pack.The two most important people who can help you with this are the actual contractor(s) who give you firm quotes on the work, and the real estate agent you plan to use when you eventually sell the property, who can give you a sense of how much value it will actually add if you were to list/sell the property.My gut says that if you were able to do some of the work yourself (not encouraging you to, just saying hypothetically) or had a very good contractor connection (like a family member) you might be able to come out ahead on it.

Do they provide extra details on the property to help aid in underwriting and appraisals?

My current career is in IT at a fairly big law firm.