A low admin fund can be a sign that a problem has been dealt with, just as much as it's an indication that it's a problem that might exist. Obviously, you need to get to the bottom of this but, despite my comments about disappearing off over the horizon, a building that has had problems but has resolved them can offer real bargains if you get them on the upswing, when their reputation is depressing prices.
No building has no problems – the issue for the potential purchaser is whether they have been dealt with or are a continued drain on finances. Good luck!