Get a few quotes. and if you do not do it, when you go to refinance into a long term loan the appraiser will likely mark the report as "subject to" a structural engineer report of the foundation. and you will not be able to refi until you have done the  work that is required. 

That can typically be structured pretty easily with a will.

I'm curious about the proper legal structure and business types one should use to minimize personal liability as well as remain fairly anonymous to the general public.

My mom has poor credit and about $30k in revolving debt, so it would be difficult for her to qualify alone.We would both prefer to hold the property, but the risk of tight cash reserves is concerning, especially if the rehab costs exceed our budget.Legal ConsiderationsIf we decide to proceed, we’re also weighing how to best structure this deal:LLC and DSCR: Would it be better to put both of us into an LLC and use it to apply for a DSCR loan?

Haven't found much resources on how to structure the deal whether to buy out partner's shares at existing basis (I believe this wouldn't be advantageous as I wouldn't get to mark the asset to market and lose out on depreciation) or open new LLC or S-Corp and buy out both partners (I would end up taking gain tax due to sale but would get new dep. basis).

-Even though I'm good at management do I treat this venture as it own as if I have no PM structure - or use my team as if I'm my own client?

Since your CPA is advising that your current structure is sound and not worth changing, it seems you're well prepared, especially with your past audit experience.

Here is what one of my 4 AIs say:The commission structure detailed in the image for a real estate transaction involving a property valued between $30M and $40M is as follows:Under $34,000,000: 1% (0.50% per side)$34,000,000 - $34,999,999: $400,000 ($200,000 per side)$35,000,000 and above: $500,000 ($250,000 per side)To evaluate whether these commissions are fair for a 112-unit apartment complex valued between $30M and $40M, let's compare them to typical real estate commission rates for large commercial properties:Typical Commission Rates:For commercial real estate transactions, commissions generally range from 1% to 3% for properties valued above $10M.

What would you recommend as a structure? 

With everything under one roof, you’ll have a clearer understanding of your premium structure and less volatility in terms of price changes.