Nice. You just don't want any islands off Costa Rica...they have dinos walking around on them.

"Are you interested in a 5-acre island off of Nicaragua that is up for sale?"
There must be hundreds of similar islands. It would be cool to look up what Nicaraguan gov't would require to make it a zona franca (economic development zone) exempt from tariffs and some taxes. The group that buys would be organized as something like 501c3 or LLC or some legal structure. Big international law firms enjoy doing reduced-rate work like this just to be known as the first firm to set a new trend. If this becomes a thing, like famous rulings we learnt in school, they want to have been a part of it. The legal doc will need, bylaws, means to appoint a board, etc. There should be some other less-public docs about all the taxes and rules you wish to avoid. You'll push the boundaries later. If you could get one software firm a couple million in revenue to move there, that'd be a start.

For it to work IMHO, you'd have to welcome people want to avoid taxes and people who would otherwise consider moving to Svartlamon in Trondheim. It would be a huge challenge to have a bunch of techies, hippies, and tax shelter seekers living in 200,000 sq ft.

On the off chance it turned into more than a place to rent a fake main office for tax purposes and/or a place to find drugs/prostitutes, it would spread to other places. Then 60 years from now some partner at Arnold and Porter will carry on about how their firm helped establish the very first free state.