My units are rented but one tenant is month to month and under market.

I am considering getting into this space (looking at some courses), but worried that its too late, and that deep local market knowledge/understanding of buyers/connection with developers etc is required to make this work, which only incumbent/long term investors will have and would be hard for a new entrant starting from scratch to catch-up...is my hypothesis valid in your opinion ?

Depends on your market and competition.  

My mum currently lives there, she is 80 and not very well, but you would also become a tenant in common and as such if you had the time you could profit 100% from the transaction, as I need cash urgently and am willing to heavily discount the asset.I am wondering if there is a market out there where someone wants to get a foothold in the London market by buying my part of the property.

I suspect most who requested cash for keys had previously received cash for keys.What I do instead is explain:- the housing shortage in my market and that an eviction will forever make it difficult to find a quality rental in this market. - I will ding their credit such that all credit cards and other debt will cost them more.- I will keep their security deposit for funds owed.- I will do my best to garnish future wages until their debt to me is paid in full.This has worked 100% time so far.  

(i.e. initial decorating and painting, bookings, rate structures, marketing, bookkeeping housekeeping, etc)? 

Nice to spot your introduction.. what's the biggest hurdle you're seeing in today's market?

If you haven't checked the market for homes with "inlaw suites" or whatever your market equivalent is that can be a way to get it done as well. 

We invest in Idaho, probably the most landlord friendly market in the country, had good luck there. 

Similar to what Patrick stated - most have ITINs and have seen a lot of loans like that and those are sold many times on secondary market. if not I know people who still originate I would say they are tougher to sell on secondary market but there are still buyersRe: jay comment - price of notes has doubled over past five years on many loans - especially defaulted or loans with some hair too them.