The most profitable property I have is a simple, compact 3BR/2BA home in a nice neighborhood with a Studio in-law unit.

Its very compact (3b/1 ba, 1054 sf), so even with some structural repair to be done, I cannot imagine a gut rehab to be extremely costly.

I hear that in this present moment a lot of people are moving out of the more compacted areas into the more open spaces.

I suspect this include compaction and compaction test you cant just put any kind of loose fill or dirt or gravel in and just build on it.. you need to hit a certain compaction % normally 95% or better.. 

If what is underneath is compact enough (looks like a gravel base) I'd slap another layer of asphalt right over the top, thickening up what is there now and filling in the bare spot up to the level of the rest.

A good installation requires a layer of gravel (compacted) and sand for weighting down the grass, along with nails.

Once it's all spread out, it typically has to be compacted with rollers, rammers, etc. to make sure it is flat and solid.Hope this helps!

If you have the space why not do a compacted dirt then gravel compacted then rock.

I am trying to come up with a way to add laundry to the unit without.Does anyone have experience with the compact units?

It implies that the ground underneath dropped because it wasn't compacted when the slab was built, but I doubt that's the case.