Remodeled the kitchen, two bathrooms, added two egress windows, patio and fences the whole yard.

Gives me chills just thinking about it.Replaced it with a crushed stone patio. 

The trees at the patio are so overgrown that they already reach the balcony of the second floor unit.

Just purchse one of the back pack plastic garden sprayers and really soak the roof.I am assuming firbrglass/asphalt shingles not wood shingles.There is also a zinc product that works well and if you are installing a new roof you can purchase zinc strips that are installed beneath the cap shingles with a small 1/2 inch band showing it will keep the black stains from starting.

Tenant agrees to keep yards, walkways,patios and decks clear and to keep premises free of junk and debris. 

Make that and outdoor seating area/patio.  

Son lives in the Inland Empire and asked if I would be willing to go to the house prior to meeting him and cover the roof with plastic.

DAP also makes a clear elastromeric sealant that is available at the big boxes which can be used  in a pinch.....we just prefer the other.Don't let roofers use plastic boots....you have to check them on this....use the aluminum based boots for a longer solution and run a bead of sealant around the upper edge of the rubber grommet that seals against the vent pipe.  

Repair or replace screen door on patio. make repair to screen room gutter(damaged).9.

In fact, I'd rather have the original windows than new plastic ones.