These are famous for being money pits with bottomless appetites.  

You may be able to get someone to place on MLS even though it is under contract to reduce the chance of a tax valuation in excess of the purchase priceGood luck

I've heard that the growth process can lead to lots of excess moisture in the unit which can lead to mold in walls. 

This method sends the excess solar power to the utility company through your meter; turning it in a forward motion, generating credits for home.

@Stephanie Smith, while Joel hits on all the primary items, if you are looking for "outside of the box" ideas, I have seen call centers go into big box vacancies, you could split it up into smaller boxes and if you have excess depth, a landscaping company may need a place to store their equipment.  

But that could change very quickly. at @Geltfinancial we have lowered rates, because we have a big appetite, but you never know things can happen very fast.

So the International travel that we depend heavily on has been sporadic at best and I feel once the planes start flying, the demand and appetite for what we have will cause a huge influx again.

The bring in gurus, get a cut of the business from the guru to feed their always increasing appetite.

3. excessive requests/complaints?

Zillow, which comes with a host of restrictions expressly prohibiting "enriching other datasets" etc)*) Those who will process and sanitize MLS for you (which is a huge task in itself) but you have to have MLS creds, meaning you have to deal with the zoo of MLS providers all by yourself - or pay something like $1200/mo for nationwide (US + Canada) listing feed*) Folks who charge per call (CoreLogic, House Canary etc.) and who have high quality sets but they don't want you to mine them so they set all sorts of call rates and excessive price per call to ward off "gold diggers"It is a mistake to say that the data "is abundant" and "if it is available, it must be worthless".