Most primary residence lenders are not going to lend in second position for a purchase.

As a seller of RE ( mainly new builds) We do see parents being protective of kids when they are worried about the new spouse..

We have a disabled son and can’t maintain full-time residence there so that’s why we’re selling.

I'm actually considering moving from my personal residence in a somewhat distant future so I was planning to test the waters before making the leap.

Some residents even suggest he find a new job.

i think selling to other investors would solve some of this, as i believe the same rules do not apply to rentals as to primary residences. 

My parents had a tenant bring in bed bug infested furniture they found on a curbside.

Hey,If "building class designation" is the same as zoning, then this seems like it can definitely be appraised as a two family, with both the legal and actual designation as a two family.Depending where in NYC, that may not help your valuation, as primary residences sometimes sell for more than investment properties, so check that out before challenging the appraisal and definitely before paying for another one.Double check all this with your lender/broker as well.Best of luck!

Investment Info:Single-family residence buy & hold investment.

If you are paying no rent in your parents beach house that could bring in a lot more to your family being rented as a beach house during the season.