Account Closed I would read into the local rules on Accessory Dwelling Units it may not be exactly your goal but a lot of cities with housing shortages allow ADUs aka In-law units to help alleviate housing shortages.  

You're probably chasing the number of homes under property management as a ratio of single family homes + apartment units. i will say there is definitely a labor shortage which is causing prices to rise as it relates to repairs of any kind but that too is subjective.

surveying the market, there seems to be a shortage of good deals at the moment.

There is never a shortage of potential tenants when I rent them out.

With 70,000 stationed servicemen, we have no shortage of military in search of rentals, or VA foreclosures for a BRRRR.

There is no shortage of people looking for rentals in my area, so I'm not worried about it sitting vacant for long if someone left. 

Rising Labor Cost, increased government spending, and prolonged housing shortages are the main pressure points.

Housing shortage, stress test and higher interest rates are a toxic combo.

In many markets there is still a shortage of inventory. 

Also many locals do not take kindly to illegal Airbnbers because it directly contributes to the housing shortage and jacking up housing costs for people who live and work here.