There are missing globes on all lights, missing knobs on cabinets, cabinets don’t close and are sagging.

Banker giving me the green light to roll into a P&I mortgage after 3 mo. 

I closed on a 4 plex in South town last month, purchase price was $850K and rents are over $8000 a month and the property was fully rehabbed and turn key outside of me having to do a driveway and some landscaping.

What's the deal landscape like in this region for SubTo, seller finance, and other more creative methods to purchase real estate?

Those costs still exist- Your scenario was a 250k property that with light reno which became a 100k reno was worth 500k. 

You're going to have to move both up, albeit property taxes in CO aren't bad but insurance needs to be fit for a house hack if you're going to have a bunch of tenants messing stuff up. 5% maintenance for a 5-member house hack is rather light. 

Plumbing by-passes or abandoned lines; collapsing sewer lines; badly corroded supply and waste lines (both can be from inside or outside corrosion) fixtures with very hard to find components; hidden electrical junction boxes...or non-existent boxes at junctions; outdated and/or underrated distribution panels; knob and tube wiring improperly connected to, or extended with, romex; Switches wired incorrectly, breaking the neutral instead of the hot side; no, or poor grounds for improper outlets; overheated connections, outlets, switches, and light fixtures; improper wire sizes for circuits and overloaded circuits; and plenty of others...all very costly to troubleshoot, locate, and correct individually.

I'm reaching out to see if anyone can recommend any general contractors that have experience/expertise in light rehabs for converting units into Airbnb properties.

You and your Dad can get involved if there are major unit turns or CapEx decisions, but let the management company lease, handle maintenance, landscaping, etc.

Cosmetic upgrades including new appliances, vanities, lighting, flooring.