Just about every building downtown is either pending litigation or in litigation. This is not uncommon for downtown buildings with the 10 year rule. I would look further into what is actually the problem. Sometimes its not much, but for example in the case of Renaissance or Cityfront, they have basically had to have complete pipes etc torn out from the ground.
I am not a fan of the Nexus building personally, but 30% occ is on the lower side compared with the other buildings is my guess where they may be in 50%+ range.
HOA fees and stability may be a problem if you are looking to finance with a mortgage. Banks are not touching condos right now that have shaky HOAs and low occ.