Management quality is the thread running through all of this. Are questions answered clearly? Do the accounts, minutes and maintenance plan tell the same story? Is there a timetable for obtaining specifications and bids? A well-defined expensive project can be easier to price than a cheaper...
I would not treat a thin reserve as an automatic walk-away. Some buildings collect more when work arises rather than accumulating a large fund. The more worrying combination would be a thin reserve, repeatedly deferred maintenance and no credible scope or cost estimate. Minutes showing the same...