You might minimally get away with a signed affidavit stating that you have signing authority for XYZ LLC and your membership % if they have any flexibility. 

Picked up a copy of the 'maintenance' lease, power of attorney and survey Saturday afternoon.

They ask a annual membership fee of 740/year, 500 for the first year as a special.

I know the land has to be surveyed, a road will have to be put in (unless we can get permission to use a driveway already in place).

Normally membership is inexpensive for just a few units, and membership comes with access to plenty or perks, including forms and templates that are specific to your state and local laws.

Even membership site capabilities.

If you're looking at acquiring a mixed-use, 30 unit building for $3M then yeah... they'll require a full commercial appraisal, an environmental report (might not need a Phase 1 here depending on what a quicker environmental survey brings up), and the others are fairly standard for a commercial or residential purchase.  

No one pays you for water & sewer lines, roads, underground utilities, surveying, marketing, and all the rest of it that goes with turning ground into structure.

Is that NARS tool something that comes with NAR membership?

Definitely wat to check out https://www.activefilings.com  they charge $25 plus state fee's for standard turnaround time,  or $125 plus sos state fee's for next day service with a few goodies included like ein # and membership certificates.