Major issues that would justify concessions?

What are some major issues that you definitely would consider asking for a concession when doing your due diligence? I don’t want to ask for concessions for the petty stuff. What do you consider to be major concession worthy problems?

If you are looking at a community with deferred maintenance it is usually a collection of small issues that you group into a overall situation that requires concessions. Everything is relevant to DD.
Total up all issues, big and small, and make your offer based on all anticipated costs.