They may charge you (at your age, I would not suggest paying for a mentor), or they may expect you to work for them for little or no money...if they expect you to work for them, they usually will want you to bring some proven experience and skills to the table that will benefit them--but at 19, most people don't have much experience to offer (that's not your fault, it's just an inherent part of being a young adult)....but don't worry, because even if you could find a mentor right now, a mentor might not even be the best use of your time at this stage...In some cases, a mentor might actually get in the way of your success (especially if your mentor isn't well-matched to your style, interests, goals, etc).

Quote from @Kresimir Lastric: Hi everyone,I’ve been following the convergence of blockchain and real estate for a while, and I just came across a project that I think is executed particularly well.SmartDeeds is launching fractional membership interests in “Project Malibu” — the concrete oceanfront estate in Malibu designed by Pritzker Prize winner Tadao Ando (previously owned by Kanye West).

Where STRs are allowed / zoningSTRs are permitted in single‐family dwelling units within single‐family residential districts or designated single‐family residential areas, with a permit. 

Also regarding height I would check with local authorities as typically over I believe 3' tall you need an engineered design and permit.

Worst case get a double security deposit, a higher rent/guest/occupany fee, and make the SSN holder the sole applicant and the other adult as a guest.  

Once she is formally included in the partnership, she should be designated as a general partner.

Also, how much time do you spend on design?

I require a lease to be signed, require a background check of all adults, require background check fee and am transparent about it all. 

So, the foundation engineer designs the slab and on the annotations, he provides for the amount of concrete in Cubic Yards, including a schedule for the cables (we're doing post tension slabs) and the minimum PSI threshold for the quality of the concrete. 

I’d start by reaching out to local portfolio lenders (credit unions are great for this) or a broker (me) who does investor loans – they usually have products designed exactly for this situation and do a 2nd position that'll allow you to tap into the equity without touching your 1st.