Please help us push for a preservation-based project that incorporates the existing building and its eligibility to be listed as a landmark.

One of the last best ways to preserve & build wealth over the long haul.And, they may take away the 1031, so get while the getting is good ( : 

An investment asset is an asset owned for the purpose of (1) preserving value (2) increasing value (3) throwing off income, or some combination of all three.A liability is something or an amount you or that entity owe to someone else.

if not, since she is so uninterested would she sign one that preserves your efforts?

Are you looking for development, value add or capital preservation?

It's really something best done over time if you want to preserve harmony.

I never recommend "Bringing one to it's former glory, with the crown molding and the stain glass, preserving the natural.... blah.)

You also have to maintain your LLC properly to maintain/preserve your corporate veil. 

If you need a preservation company let me know I work with some decent ones to secure the property for you

If she has $2m and expected lifespan of 20 years (say she is 65) and she has no need to preserve principal, she can happily spend  100K per year with 0 return and 0 risk (cash).