I am not a fan or keypad locks, Ring doorbells, Nest thermostats or other technology in long term rentals. 

@Sacha Allen Here in Las Vegas as an owner-landlord and property manager I like accent walls, feature walls, framing some of the windows, cool looking ceiling fans...

There's not much ventilation so I thought about adding vent fans or windows to the hallways and stairwells as they all have at least 1 exterior wall.A cheaper and easier solution I thought might be a commercial grade air purifier in each hallway and some plug in air fresheners.Every room has 2 vent fans, a window, and a through the wall air conditioner so the rooms have good ventilation but the hallways can get stagnant, especially in the summer when it is hot(no a/c in the hallways and stairwells).Any suggestions that don't cost a fortune? 

Although I did refinance when things hit the fan and rates dropped.

Lets look at what you got going for yourself:-sounds like you have a decent paying job-your family has been in the RE business for a while so I'm sure they would love to offer you some advice and bail you out if Sh*t hits the fan-its only a total investment of 45k which is a lot of money but still relatively affordableAt the end of the day if nothing goes your way, it'll be a great learning experience.

There's not much ventilation so I thought about adding vent fans or windows to the hallways and stairwells as they all have at least 1 exterior wall.A cheaper and easier solution I thought might be a commercial grade air purifier in each hallway and some plug in air fresheners.Every room has 2 vent fans, a window, and a through the wall air conditioner so the rooms have good ventilation but the hallways can get stagnant, especially in the summer when it is hot(no a/c in the hallways and stairwells).Any suggestions that don't cost a fortune?

I'm a big fan of live music, martial arts, hiking, and (surprise) video games.

If you're a fan of the planet and ensuring a safe and healthy living for many generations to come, this is a big step in the right direction.

The photos will get you interest.Lastly, I am a huge fan of staging.  

@Esther KimNumber 4 sounds like you need to install exhaust fans in the bathrooms and hook them up to the lights so they always turn on when the lights are on.The rest seem like reasonable repairs.