Design principle from a master gardener: Create an element of surprise in your landscaping design. 

Broken blinds, broken door hinges, broken door locks, paint applied to walls that didn't match, broken faucets in the shower, broken tiles in the shower stall where the tenant said they 'slipped', paint rings on the patio floor, a garden in a HOA that had been allowed to get overgrown - on and on. 

The renter's husband unscrewed the water from the washer to connect the garden hose to the water connection and ran the hose outside to wash his car while the other water hose was in use, forgot what, maybe kids playing in the sprinklers. 

People have to bathe outside with a garden hose though.

Lawn / garden care, pool care etc?

Oh, it had it's French Quarter back and the Garden District was nice again but any other area still had a lot of vacant houses.

I've noticed that several Olive Gardens use it.

Of course I've had hundreds tell me how much they love to garden...I think that must be slang for smoking pot.

The larger the number of units the better the positive cash flow.Dollar-for-dollar, multi-units are less expensive that single family homes and dollar-for-dollar you make a much higher  ROI.One roof to repair, one tax bill, one gardener and one trip to collect the rents.Multi-unit properties have both present and future income that is unbelievable.

Cabinets, in 7 years, and garden structures like fence in 15years.I'm pretty confident the above is accurate and logical.