Landlords can enter a tenant's property for a variety of reasons, including: Making repairs or replacements Responding to a tenant's request Removing unauthorized window coverings Preventing waste of utilities Changing filters, testing, or replacing smoke detector batteries Inspections Helping with an emergency inside the unit Posting a notice of eviction"Research your state laws because some of your comments indicate a lack of understanding of the landlord/tenant laws where you are operating (like threatening the tenants to keep the security deposit if they don't respond to you, I doubt that is actually a valid reason to keep their deposit, or evicting for late payments, or charging the tenants for your warranty repairs because you missed your 11 month inspection window which was your responsibility, and it looks like your lease says you can charge up to 18% interest for unpaid fees, is that actually legal?).

They also inform me that the Water District is planning to force me to vacate, and remove my sewer line off their property.

With new units I will save water and remove the larger older tanks.Installing Power Flush by Glacier Bay from Home Depot at $139 each, They have less chance of getting clogged.

I told them to remove their equipment at the end of this month.

Maybe they are good people and want to pay for the damages and remove the remaining tree?

There will be some extra costs if you're offering snow removal.

You will likely need to pull out and cap the bathroom plumbing if the bathroom was not approved and remove the stove since the city is already on notice of it.

Now, probably after a long and drawn out court battle, a plaintiff can probably get the lien removed as a “sham”, but a cursory examination by the typical plaintiffs attorney would probably not produce that conclusion.  

Prior to losing the home in foreclosure the previous owner had retaliated against the lender by cutting out most of the exposed electrical wiring and removing the heat and air units from the property. 

Lawn cutting/snow removal you can get quotes for, plan for some vacancy, property management software if you will use any.Hope this helps.