I don’t know how 2 people got 3 homestead exemptions but that seems like something the local taxing authority could catch pretty easy.

As a result any “offering” must either be a registered securities offering, or qualify for an exemption from the required registration.

Quote from @Randall Alan: @Geoff McFarlaneYou have 5 years to be able to take advantage of the ~$500,000 gain exemption.  

All companies must apply unless you meet a certain exemption.

-based LLCs, corporations, and similar entities are required to file unless exempt.

I would get with the city asap and find out all the details on this.It could be possible that if the LLC changes hands that it loses it's exemption.

Day traders are not exempt unless they elect mark-to-market (MTM) accounting, which eliminates wash sale tracking but taxes gains as ordinary income.To manage taxes, track trades closely, avoid overlapping purchases, or consider MTM election if trading actively.

Quote from @Eli Fazzo: @Will Gaston for how many investment properties can you use this 25% exemption? 

Here is an article from Wolters Kluwer that covers the entities exempt from reporting.

As for your neighbors, they could have exemptions like Homestead, widow, military disability and many others that can reduce the amount of taxes.