I have attempted to put it on the market for sale, but there hasn't been much interest.

Perhaps to the tune of $2-$3k per month or more.Your property will, in average market conditions, appreciate. 12-24 months after house hacking you ideally will find yourself in the favorable position of having 5-10% equity through loan amortization and appreciation.

ARV : $250,000Monthly gross rental income: $4600Monthly mortgage payment: $1100Property description: completely vacant 4 family (three 3 bedroom, one 2 bedroom apartments) in a competitive rental market with housing shortage (large pool of candidates) 7000 sq ft property with massive units, roof was torn off and redone, newer hot water heaters, furnaces, electrical, plumbing.

Leveraging Mark's local market expertise, we secured the property for $60,000.

With MTR there are places where you can market to traveling nurses and medical professionals who are looking for something furnished for 1-6 months.

LA is a tough market.

Often they will tell you what they're having a challenge with (like finding off market deals, a reliable property manager, etc). 

I am currently studying for my real estate license and analyzing the local market.

For those that are in the MTR space, what types of clients are you targeting?   are your getting traveling nurses, business professionals, displaced families, insurance claims etc?

Study the market.