Yard work, cleaning, painting, mowing, etc though were paid. 

However, they can't measure the overall layout, the countertops, the view out the front window, the creepy neighbor with six dogs in the back yard, and many other subjective things.Use AI to measure a general market or community.

I sold the house, and instead use some of the capital to buy a SFR with a yard.

I have a tenant that I use to keep the yard clean and take out the trash.

The neighborhoods were very social, neighbors doing crawfish boils in their front yard for anyone who was hungry, musicians and artists, second line parades could start up any time.

However we would be "getting more house" ( access to a second back yard, tool shed, driveway, second storage unit, etc)When I look at other houses in the area, with the intrest rates as they are, I don't understand why anyone would buy multifamily and rent it out when all of these calculations would be negative cash flow.

This also doesn't factor in that you may have to reduce the rents of the existing tenants since they are paying based on certain circumstances (IE access to the garage or yard space). 

In between my agent and I would walk houses where human feces was smeared all over walls, flea infestations were so bad you had to spray yourself down in the front yard when you came out, and rugs with years of dog and cat urine baked into it.

Then probably whether yard is fenced, etc.

While that one cash-flows better, it doesn't have any sort of yard and the privacy is limited since it's surrounded by multi-family properties.