The back part of our property was not kept mowed. It was just bush hogged a few times a year. I wanted it mowed regularly so we bought a zero turn mower and we've been trying to dig out all the roots and rocks. This has left divots and bumps which slows down the speed you can mow. We don't want to tear up our new mower!
The new shop had some excavation done to accommodate the footings and slab. We have a large pile of dirt...and rocks and roots. Lee has been using the tractor to take buckets of dirt around the yard and filling in the depressions.
I expect the grass will take some time to fill in. At least we'll be able to speed up the mowing.