Supply is so tight, they need temp space that will give them time find and close on their purchase.

No.  10% - 20% (depending in various criteria) will need to be supplied. 

It also has seen a lot of building increasing supply.

First, instead of fighting over deals like there's a limited supply, why don't we all create our own "abundance mentalities" - because no one on this thread has the infrastructure to handle EVERY possible deal:)Secondly, I find it odd that agents are fighting against "off market" sales, but could care less that at least two-thirds of rental transactions are technically "off market" or "off-MLS" (no agents involved).Yet, every agent licensing course covers the handling of rental leases.Guessing that agents only get wound about this topic if a certain number of zero's are involved?

You can examine the number of available properties, search trends, and the ratio of demand to supply.

Additionally, the record number of apartment unit deliveries in recent years has led to increased supply, putting downward pressure on prices, occupancy rates, and rent growth.Operational costs have also been on the rise, further complicating the financial outlook for multifamily properties.

Also have an understanding of housing demand versus supply for houses and apartment rents (I wish I considered those factors when buying my first home).Also, make sure you understand debt financing and you spending time modeling out your costs. 

I have 30+ years of corporate finance experience; FP&A, Supply Chain Finance, new business ventures, tech infrastructure investments, and entertainment.

I supply paper products, coffee, hand soap and cleaning products.

The best bet for that would be getting an awesome property manager that does basically everything aside from supplying the financing for the home.