This amounts to lost opportunity because if you had purchased RE, at the closing it can start producing return. 5) ADUs detract from the existing structure whether this is privacy, a garage, or just yard space. 6) this is related to number 1, but there are many more buyers looking to purchase homes for their family than there are RE investors looking to purchase small unit count properties.

The garage does have electric ran with a small meter base.

I'd be looking at multiple structures. we try to build below the average new build cost in our market in Columbus Ohio which is 515,000 last year and we target land 40-50k and urban core adjacent where we get higher price per square foot. we build for clients with margin around $190 a sq ft depending on multi or single. we can get that down in our triplex it's a little higher on our single family homes because of garages and limited economies of scale. hope that helps. idk Philly but if you show me the area and styles of homes I can give you some more insights. 

We bought a single family up here last year and converted a garage to an ADU, which rented out really quickly to a great young couple.

It’s a fully renovated, modern-styled, 2-story townhouse with 3 bedrooms, 2 bathrooms, and a basement in Baltimore County, where I live.

We added value by investing $45,000 in well-planned renovations, modernizing key areas, enhancing curb appeal, and ensuring market-ready quality.

-There is more rental income potential because of the large yards, by having a tiny house/renting out the garage/etc. 

There's also a detached two-car garage and workshop.It exists in kind of a twilight zone between commercial and residential. 

Modern well-constructed condos will probably last a long time.

For example, buying a triplex and converting the garage into a four plex and converting it to an Accessory Dwelling Unit.