and licensing of massage therapists in particular.

You will be scrutinized very closely.

All kinds of regulations from Building Code to Zoning will come into play.

It's not something to be taken lightly, especially the licensing part.  In many states, offering massage without a license ia a felony, if you can believe that.

Consulting a lawyer with business experience might be a good idea.

In the event that someone would want to open or help open a MP.  What recommendations would anyone and everyone have to help increase security and limit risk?  Inquiring minds would like to know...