Neighborhood zoned R-2-N, last SFR on the block...the rest Low Density Housing, how?

[Keason Torian]

Hello! 

I'm currently renting a SFR in Long Beach that is zoned R-2-N. I am surrounded by low and moderate density housing throughout the area despite all the lots displaying the same R-2-N classification on the City Planners website. For context, we have the last SFR on either side of our street for 2 blocks.

I am considering an ADU & Jr. ADU project on the property because that is the max(?) a R-2-N zoned property will allow.

How is it that every other lot within a stones throw is zoned the same, but has various types of multifamily/condo/apartment structures? (avg. 6-10 units, mostly studios, one/two/three stories). 

Is requesting a modification to zoning a fairly straightforward process? Anyone with experience converting a SFR zone to a low or moderate density apartment style multifamily in Long Beach, Ca? Any information would be awesome! Thanks!