I am new as well but I can definitely say that even with my calculations, 850k is a STEAL in that area you are buying at. LA area has been talking a lot about it being in a bubble but I don't agree fully because people are not taking into consideration that this could all just be a strong bounce from the bottom, not much to really panic about that.
If you are looking to wholesale this deal, I think you will not have a problem turning around and selling it. Of course there is many more factors to consider but just based on paper this sounds good to me. West Hollywood area demands high rent. Based on your numbers I will also say in addition you have a lot of upward room to raise the rents too.
I am seeing that the good multi-familys in the area are closing after being on the market for 15 days. Some are on the market for over 100 days (probably something bad with them) and there really isnt anything in between. Like I said earlier about the bubble fears, LA is experiencing a significant bounce off the bottom so if you are looking to buy a hold in the short term, take note.