Let me reiterate the caveat that all of my knowledge and experience is in the institutional quality commercial real estate space, not the individual/high net worth arena.
First, the ground lease is more marketable once the hotel is fully built and operational. A developer is more likely to default during construction and that brings in a mess of complications with their lender getting the building built to generate your income stream.
If the full ground lease was being sold, again assuming a typical and financable lease document, you're probably looking at a value in the range of $16-$18MM so your 1/16th would be +/- $1MM based on a 4-4.5% capitalization rate. That said, because of the factors I mentioned earlier with the minority interest and different buyer pool, I wouldn't even begin to speculate what the value of a non-controlling 1/16th interest is worth or who would be the right person to talk to about selling it.
It sounds like you have a nice asset here, and without knowing anything about your financial situation, it may be worth more to you than the open market. Ground leases are a great way to establish and build generational wealth that can be tax advantaged if structured properly.