Technically you can't put up a 30 ft wall - you have to get permission and there is a height restriction on perimeter walls.

Back in the day when Maya House and others in the area were built people just built, they didn't often bother with getting a surveyor.

And for those that choose to now hire a surveyor - make sure he is licensed! There are a few folks on the island the purport to be surveyors but they are not qualified or licensed and often make outrageous mistakes.