The quoted exterior price per pier (concrete) ranged from $225 - $375 per pier.

Something to look into, nonetheless not enough info to give you a concrete response. 

I typically only run numbers based on concrete things that I know of right now.

For example, if someone has 3 listings, they'll be paying around $50 each but if someone comes on with 50 they may be paying like $25 (these are not concrete numbers) they also have add ons like dynamic pricing and smart locks which are additional. 

I use ChatGPT to take my thoughts and arrange them in a way that sounds clear and polished since I’m not always the best with words.

This is usually the financials they use from their Accounting system and not concrete numbers but allows you to see how they are doing.

I don't know the cause of this problem, but in other areas of this floor you can feel low spots where the concrete slab was not completely level before the flooring was laid.

As for the original post, I think something like this works best if it is concrete: dates (say the last week of July and December), monetary consideration (I would suggest a separate sublet provision wherein you pay them for use, rather than working out rent credits), insurance and liability requirements, etc.

Have contacted building and concrete companies and approximately looking at 28 per sqft buildings built.

Is it worth the money to level the concrete in the basement of a future rental?