Where I grew up they had that ordinance and my dad put dirt/grass on the sidewalk.

That is, you won't get thrown into jail or fined by the city, state or feds if you do this.

This was not only not good for the grass but the water bill was insane.If you can avoid paying a tenants water, save yourself the trouble and make sure they get the bill.As to the OP, I think while not necessarily illegal it would be unethical and the tenants may (will) feel slighted if they figure out what's going on.

All of the large third party sites (zillow, realtor.com, trulia, etc) are fed from MLS and the data is usually outdated by the time is gets there.

If you snaked a line, with the correct size head, the snake is typically fed from an upstream access point, like a toilet and progress downstream along the line, and the operator does it by feel, they won't see what they cleared but can tell if its a soft blockage or something else.You had it jetted.

.$ 25 Grass/Snow34 Trash Pickup376 Heat Bill Total Both Buildings (Averaged over 12 months)75 Electric Total Both Building (outside lighting, furnace motors, sumps averaged over 12 months)539 Water Bill65 Insurance ($100K Liability Policy Only, Auto Owners)300 Taxes250 Cleaning/Maintenance/Repair$1664 Total Reoccurring ExpensesCurrent Monthly Income From 10 units $3950 @ $395 per month per unitDifference Between Monthly Income and Reoccurring Expenses: $3950 – 1664 = $2286 netHe included a tax bill from 2013 that has the tax assessment listed as $56,000.

Then find one thing in real estate you want to learn and stay with it until your fed.

We already had the grass cut. 

In your case though where the apartment is empty, no notice is required assuming your tenant has terminated tenancy officially.You can mow grass whenever you feel like it. 

I was born in Grass Valley!