The timeless quote of architecture, "Form follows Function", by the renowned architect Louis H. Sullivan, can be clearly applied in the watchtowers you've featured here! Because of their strategic purpose, their usage had an economic advantage where ships used for the trading of imported goods were monitored strategically by rich merchants from higher elevations.

So now, if the city council already banned their construction, what other structures or modern methods are they currently using to replace the observation towers that watch over the harbors @cuvi?