Your competence will ultimately drive your reputation.  

I've been trying to do research as far as different DSCR Companies but not sure who is reputable and who isn't.

In most states Section 8 won't pay for damages.

Seems like there are plenty but hard to tell which ones are reputable.

I am trying to find a reputable realtor / agent who will help me place tenants, but also be able to help with semi-annual / annual walkthroughs (for a fee of course).

This is true but 1) the problems in LA has extends beyond the city's core and 2) the city's core is essential for the city's reputation, which in LA has nosedived which will make it harder to lure in new companies or even keep ones there which are considering moving.

The longer you take the longer it will take.I'd rather a $1000 loss than to prolong the situation and lose the grand along with several more months of possible rent and aquiring more and more structure damage to the property.

I observed the vandalism damage with my own eyes, then I wrote him a cash offer, but I offered him like 20k and he didn't take it.

I would give him a written notice that the smoke is damaging my rental and annoying the neighbors.

@Jaekwan LeeA house hacking inspection checks for structural integrity, roof condition, plumbing, electrical issues, HVAC systems, windows, insulation, base and attic damage, unit conditions, and code compliance.