[QUOTE=villagetinker;1834519]OP, you may have others costs, your irrigation was setup for grass, you will probably need to have this modified at a minimum. As for all rock, you will of course need a weed barrier, and then after 1, 2 or 3 years you will be weeding the rocks. Also as you noted, you will need ARC approval. We converted several hundred square feet of mulched landscaping to rock, weeds are worse in the rocks.........
This advice is without doubt the best. If it is possible wait until you get here.
You need to take the advice of this person, everything that he said, take it to the bank, many people have learned the hard way, by not getting prior approval
I live in an end unit, zero grass, and I managed to add an oversize golf cart garage.
You made a wise choice, end units are rare and much sought after.
I wish you all the best, go slow, your landscaping is not a big deal, eliminating the grass not a problem, and adding rocks is the best solution w/heavy duty matting. 
PS: Preen works well for me, and on occasion a squirt or two of vinegar/water.
Weeds and Fire Ants hate me.