There’s just not enough ADU supply (IN MY AREA) for appraisers to base off of.

.-- The influx of STR supply has certainly brought down Airbnb revenues the last few years for everyone.

We know supply is a big issue with low inventory across the whole country.

Depending on the number of jobs and number of new development going on in the area it may just be simple supply and demand.

That gets worse as you get farther out of the cityTLDR: values depreciate, inflation has gone basically nowhere in Japan for a long time, the supply of housing is pretty good compared to demand (unlike the US) and that's because of flexibility with rezoning and development, taxes on rental income are high. 

And the reason why your "tale of two halves" will play out as you described.Demand:  This has actually been high almost all along, but rent growth hasn't materialized in response due to high levels of new supply. 

.), but the bedrooms are regular keys, as @Jonathan C. mentioned for the front door, the unit is set up to send me an email when the batteries are low. i also have another student rental ( 8 rooms, 2 entry, 2 units + utility room) one master key and each bedroom has its own key that will get students in the entry, there unit, and there own bedroom. had a locksmith do that one. cost me a few hundred dollars with keying and supplying the locks ( 13 total ). i like both setups but may look into the landlord locks again for my 3rd student rental i just purchased.

My experience is those have been in short supply since beginning of time. 

Typically, co-op's are less valuable than condos for a number of reasons such as supply/demand, lack of investor interest, older units, estate planning issues, financing and board policies. 

Hi Jemini, I would start by doing research in the markets you're interested in to see what the rents vs. purchase prices are along with looking at the supply and demand of the market.