Keller Williams Santa Fe
All this to say that when you disclose the lawsuit to potential buyers, you can also provide the roadmap forward. Since your specific home is, according to what you say, problem-free, then the buyer need only be concerned with the common property issue. Hopefully the association board has already been in touch with their insurance company and has received bids to ascertain what remediation costs would be and, if it comes to that, what the assessment for each homeowner will be, and for how long. The more such information you can provide potential buyers, the better. No one likes walking into a home purchase situation with an unknown financial obligation.
You could also have the property pre inspected and take care of any issues that may be raised. Give the report to the potential purchaser to show your unit is in good shape as evidenced by a neutral third party "expert."
Good luck with the sale!