I think $250 is high. I generally use $75 as a good point in my prior rental areas. You want to avoid them from calling you to replace lightbulbs, but you want them to call you if a switch or socket may not be wired correctly. Most of the things that happen regularly and may be under $75, I specifically called out, such as lockouts (about $40 from a locksmith) and plumbing stoppages (which can be under $100 for a local plumber). If I have to have any major trade in the building, even if just to inspect or do something small, I probably would want to be tracking it. $250 would cover up a lot of things I might want to know about.