Sub to. Is it legal in Massachusetts?

[Jourdan Mercer]

I'm a new real estate investor trying to understand creative methods of purchasing real estate.

I've come across the idea of taking over a mortgage sub to and I've heard some mixed things as to whether it's legal or not...

I know Massachusetts can be sticklers in many legal areas compared to other states.

I've reached out to multiple lenders, attorneys and agents to get their take on it and it's kinda mixed.  Probably leaning more towards it's not legal.  

Does anyone have any knowledge and/or experience doing a sub to in Massachusetts that would in fact make this legal or illegal?