Well you could always get a giant one to replace those old fashioned ones.

Mostly surface cosmetic updates such as new trim, paint, and minor exterior cleaning/fixes.

Pouring a concrete patio or installing pavers makes the ideal surface so the tenant can put out some seating, etc.

All you're doing by going that route is abdicating your responsibility in favor of the previous tenant, who may or may not have been doing what needs to be done and in the right fashion.

Scope of work, ie: surface should be totally smooth, paint quality?

South Side Carpet Cleaning does a good job.I almost always just replace with hard surface flooring though.

If you are just talking about non-structural surface cracking that looks like hell, I would either just epoxy the whole thing or you can float a concrete resurfacing over it.

$550 for a new opener is a little pricey on the surface but not silly high and we have non idea what else was done, if he serviced the door, new keypad, remotes etc....3K for a garage door seems about 2.5 - 3x high at least for us locally. 

Jordan E Smith, as frightening as variable rates may seem on the surface there is much to consider when looking at the product. 

You are focused too much on surface.