I’ve made it clear that I need reasonable notice, but the agent has flat-out told me that I don’t get to choose or consent to the times.

What are my best options for leveling the garage floor so I have a flat surface to begin the interior build out on?

Of course, tough to build 50,000 units in one person's back yard, but there will be some people build granny flats, or garage apartments and you may see some office converted to residential. 

https://www.har.com/content/department/mlsHouston Real Estate Highlights in September, 2024:-Single-family home sales increased 1.7 percent year-over-year;-Days on Market (DOM) for single-family homes went from 45 to 51 days;-Total property sales were down 3.3 percent with 8,228 units sold;-Total dollar volume was statistically flat at $3.3 billion;-The single-family median price was up 1.1 percent to $335,000;-The single-family average price edged up by 0.3 percent to $415,435; -Single-family home months of inventory registered a 4.4-months supply, up from 3.4 months last September.

I own all of the buildings except two (a 6- unit building and a 2-flat). 

It bridges to my phone and all I get on my real phone is the sellers real phhone number so you are flat footed talking.  

For lower sale prices you might see them have a flat fee minimum perhaps something like $2500 or $3k. 4.

Depreciation recapture on real estate is taxed at a flat 25%.

Most of my clients go 5yr flat because that gives the best rate in the market.

Typical options are: pass-thru, flat rate or percentage.