My question is, is there anything more I need to do to (i.e. issue a formal written notice of lease violation) in order to prepare for the possibility of keeping a portion of their security deposit to pay for eliminating the odor? 

99.99999% of all lenders are going to come after the secured asset, not the entity's other assets. 

Also check your states Security deposit laws.

Efficient negotiations secured the property for $158,000 on favorable terms.

Finding a property, negotiating a deal, securing a tenant, and managing a rental is seriously hard work!

If you're coming back to SD and want to live in the home you have here for the long haul, it's nice security to pay it down.

Furthermore, if I am understanding things correctly, RE investors use the equity in their properties to scale/secure more investments, right? 

However we also have a law that states that we must provide an accounting of the security deposit funds and refund (if applicable) within 30 days.Solution: Create the security deposit move out form.

What are the best strategies for securing funding and investment for a private lending business?

That always makes it so much harder to rent, or secure a great tenant.Here's my standard go to list now for long term rental updates:-LVP that looks like wide plank white oak-Ultra Pure white on all the walls-Vertical/ modern stack backsplashes and showers-Pop of color on the cabinets (pop of color can include black too)-Butcher block countertops (lower end) or white quartz countertops (higher end)-Modern light fixtures in brushed brassKeep it neutral still but a couple of style choices with the light fixtures (which are cheap) and it will appeal to the masses.Good luck!