I've worked with customers in the "Central Los Angeles" area for about 3 years now. It's a very, very rough area, but also one where opportunity for rental units, flips, lot split builds and multi family have existed for some time. Plenty of diamonds in the rough - well built homes from the 1920's and 30's - on very large lots, waiting to be gently rehabbed or rented "as is". Unfortunately most are late to the party. Once the LA Rams Stadium was given the green light, many good opportunities to purchase went up by $100k or more.
If I had the $$$ to dive in, my guess would be to buy up light industrial or mixed commercial use. Most of these buildings are tear downs for land value. Cobble enough of these sites together and you could put in new apartments or better mixed use buildings.
My .02c
SGIP