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

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.

Study the market.

You can't arbitrarily decide that you don't want to allocate any of the proceeds to the portion of the property that will create Ordinary income recapture (thus can't be included in the installment sale treatment) - it should technically be allocated amongst all the assets in accordance with their fair market value at the time of the sale. 

Recently I saw the duplex that is DIRECTLY across the street from my property come on the market, and I would love love love to jump on the opportunity to buy this property as well.