I've only ever done rehabs (with some so extreme that they were practically new construction!)

Use this as an opportunity to show good will to your tenants while simultaneously inspecting how they are caring for the rental.

Hello! I am a real estate agent new to real estate investing and need some advice -
1. Which NAICS code should I use for my activities?
- Residential purchases, remodel/repairs, and re-sale (flips). I'll typically...

While their online marketing would not have been legal when I started practicing, it is perfectly legal now. 

Clearly practice makes perfect, but if I can learn from your experiences, it could save me some grief! 

We might see buyer agent commission rolled into loans as a standard practice in the coming months and years.

There is no legal limit, but there is almost always a practical limit because a sponsor can only deploy so much money before they have to lower their underwriting standards etc.

Hello! I am a real estate agent new to real estate investing and need some advice -  
1. Which NAICS code should I use for my activities?
- Residential purchases, remodel/repairs, and re-sale (flips). I'll typically...

Quote from @Kevin Reinhardt: Best practice: screen and approve every adult, whether they work or not, and have them all sign the lease.I highly recommend you purchase "Every Landlord's Legal Guide" by NOLO or "Managing Rental Properties" by Brandon Turner.

And without knowing your full financial situation, it's hard to give you really practical advice.