If you do outsource, some management companies will cover various things like cleaning, supplies, etc. so look into that as well. 

we invest in non performing mortgages (and do some short term RTL's), and the indicators we look at are our inventory supply and where is the inventory.

Now track either housing shortages or for sale supply, or on market data for those same data Points.When you do this, you will question why you are even thinking about the Stock market. 

Recent zoning changes now allow for three dwellings on a single parcel, and parking requirements have been lifted in denser areas, both of which have boosted the local housing supply.

Though I have not personally contributed to these investments for tax credits, I have personally seen these investments in action and these investments can help provide more supply of housing and development that would otherwise not be there.

Because of this the supply is relatively low which means the ones that do exist tend to make good money, especially if you theme it toward bachelor/bachelorette parties.

Basically, the demand is much weaker than the supply. 

Do you think supply with surpass demand?

We supply kitchen appliances for all of our units, on the SFR's we supply dishwashers because they are in nicer neighborhoods where a tenant would expect it.  

However they cannot supply 10,000 of those deals.