Rey, I looked at that this summer, forgot the initial filing fee in PR but I remember it is a buck and a half annual fee, not out of the line, I pay $110 annual for my corp here.
My advice, not liked by the PR Bar I'm sure, is you can do the LLC yourself without a lawyer. What I tell my friends who ask me to do theirs is do it yourself, but do it with your CPA, very important.
If he doesn't have the forms, they are readily available on line.
Lot's of ways you can set up LLC's or Corps, but you want to set it up the best way for you tax wise. EG, my Corp is a Sub-chapter S (IRS code), bottom line being I only file one return at the end of the year, not a corp return and also a personal return. That saves me ???$$$ every year.
And other things like that. And it's probably a little more complicated in PR for you since I think you have to dance around numbers so that you are not paying PR and also paying Uncle. A CPA is going to be leaps and bounds ahead of most lawyers re: those issues unless they are tax lawyers, in which case you are going to be paying them tax lawyer prices.
Any Puerto Rican CPA, (unlike Jose the "bookkeeper") will know how to fill out the paper for your LLC app. They are filing returns for LLC's regularly and see how different people in different situations have their LLC's/corps set up.
Any probably for a smallfee he can be listed as your required registered agent and his address as the LLC address which will provide a little privacy. I presume in PR those ID things are on-line for people to see.
Would be my move.