Sentence Correction (SC) | Until 2010, a state tax regulation known as the 80-20 rule

A) Until 2010, a state tax regulation known as the “80-20 rule” required that condominium associations receive at least 80 percent of their gross income from their tenant-shareholders, and no more than 20 percent from other sources, like ground-floor rent for restaurants.

The comma before", and " is also correctly placed, as a comma between two long parallel clauses should be (also before the coordinating conjunctionand !).
A is the best answer choice, though hellishly convoluted.