It is a older non rehab property but things are straight and roof, plumbing, electrical are all in good working order.

Yes their rates are steep, but that's hard $$$ for you.

If your children decide to sell it (you can't predict the future), they will likely face steep capital gains tax. 

It covers internet, water, trash, cable, and exterior (roof, siding, etc.).

The home was in rough shape—think mold, a hole in the roof, and years of water damage.

The deferral is all on major capital expenditures, roofs, HVAC, Water heaters. 

Eg roof and siding on one, all new paint and countops.

No guaranteed way to stop a determined, experienced thief:(Only deterrents that push them to easier jobs.The roof may be a good idea - until they figure out the just need a ladder to get up there and a rope to lower it down. 

Furnaces break roofs need replaced and plumbing needs repaired.

There are never full photos of the mechanicals and basement and roof line so you will never have even a bare inkling of what the potential repairs will be.