As mentioned, generally that is not most HML's cup of tea.  

Just to recap so far:- Clean Gutters - yearly- AC maintenance - yearly- AC filters - every 6 months- Gas furnace filters - yearly- Hot Water Heater drain - yearly- Preventative pest control - quarterly (it could be bi-monthly, depends of the area)- Sewer and storm water line clearing - ones in tree yearsWhat other items you have as a preventive maintenance ?

Land has trees on it.

Not sure how since there was a hole in the roof of one of the upper units and a tarp of 4+ months catching rainwater, tenant heating a unit with their gas stove due to lack of heat, foundation about to cave on one side, (Duluth's steep hills could actually collapse the house on cave in) rotting tree trunk holding the house up in the center with 3-4 layers of 2x4 shim board etc etc.  

Not really my cup of tea to go that far.

They need to see the forest for the trees. 

Feel free to PM me and we can meet for tea time or other drinks. ;-) The more the merrier. 

I owned 3 duplexes across from Zeiger elementary (owned them while they were building the school, cutting down trees and raising the water table so our furnaces under the buildings burned out!) 

Just not my cup of tea.

I go to most of the BP meet-ups at Anna Liffy's or if you'd like to talk one on one, I could do coffee (ok, I drink tea) one day or evening if evenings are better for you.