I would recommend to just start attending some of the large player's conferences and networking your way into a relationship there. Recently attended a large multi-family investment conference and connected with a number of big players in the industry. All were nice and welcoming. I am sure if you went to a few of these with a pitch of your specific skill set and the desire to work for free they would love to have you on their team. Also, when I say skill set, it needs to be something that will directly help their business, examples include developing and implementing a social media marketing program for their company, being a deal finder with a concrete plan of how you can find them off-market opportunities, being skilled in excel-macro VBA programming such that you can automate and improve their underwriting process. If you don't have any of these currently, work on them and persistently communicate with these guys until they let you join their team. Started at the firm I am at now as an un-paid cold caller.