No big deal, I included that in the contract and then also disclosed that I was an agent acting on my own behalf.

(and when some other(s) may take advantage). once I figure out if there is more I need to do to protect our assets, I will be willing to disclose any and all relevant information about the property.

On first thought I remember an instructor I had that used to say when in doubt, DISCLOSE, DISCLOSE, AND....DISCLOSE....However, while you said you are listed on the LLC you did not say if you are the managing director.

Do buyers realtors disclose they are realtors when they bring an offer?

This will open the door for you to negotiate with the seller in a more direct sense but the agent still have the duty to disclose.

The tax collector disclosed to me where the tax bill is being sent however told me that there was no way for her to find out who is paying it.

Now that they know there is a problem they would have to work with you on the price or to disclose the problem to other potential buyers. 

Sell it as-is while the market is hot without addressing the foundation.If you go out and get more bids for repair, those will need to be disclosed if you eventually decide to sell which will hurt your sales price.

@James Kojo for large deals it is common for the seller to disclose financial information before LOI.Sometimes you will get a seller who refuses. 

Since the funds are  in a pool, you have to disclose, fill out forms and register what you are doing to avoid complications with SEC and IRS.