Second link is a similar size, albeit 10 year older home, in Setagaya Ward (a very desirable neighborhood), but still "only $1.2M. https://www.homes.co.jp/kodate...https://www.homes.co.jp/kodate...(2) Age. 

In my current roll, I manage 17 shopping centers of various sizes and select sites for new gas stations in the Arizona market.

Specifically, I’d love to hear about best practices for managing shared spaces, screening tenants, and setting up house rules.Additionally, I plan to split the utilities among the tenants—any advice on how to handle this efficiently would be greatly appreciated!

So, the first question they usually ask a PMC is about fees - instead of asking about services and HOW those services are executed.EXAMPLE: PMC states they will handle tenant screening – what does that specifically mean?

You'll really need to screen your property manager/contractors.

From there, I would like to consider a 1031 exchange in the future to acquire more units.My current property management company suggested that they could handle a mid sized apartment building but I would absolutely not consider them for it as I believe they have overextended themselves and communication is lacking.

So, the first question they usually ask a PMC is about fees - instead of asking about services and HOW those services are executed.EXAMPLE: PMC states they will handle tenant screening – what does that specifically mean?

I have a decent size RE portfolio, and use professional property management.

Given the size of the asset, these won't be huge, but something to consider.REWARD - In addition to the benefits stated above, the only other reason I could see doing one on an asset this size is if you wanted to offset a property sale that would have a large capital gains. 

of those I like next door best because it is hard to fake and the reviews are easily tied to a reviewer in your community.The costs of ADUs vary significantly for various reasons including by ground up vs conversion, difficulty with lot (sloes, access, etc), finishes, and even the size (bigger typically have lower PSF).Good luck