Anytime someone talks about future land development, especially on Singer Island, it's never a sure thing until they actually begin the construction process. Many announce plans only to have them shot down by the City Council. Marriott, if I recall correctly, had several issues getting Oceana Palms built. The Oceans Mall down by Ocean Pointe at one time was suppose to become a high rise hotel with a shopping mall but was shot down by the City Council over concerns about public parking for the beach.
I'd welcome a wellness spa on that land vs another hotel or high rise condo project. It seems to me it would likely be a low rise building with minimal impact of views. Somehow I don't see a wellness spa as being something that would be a profitable venture on that piece of land. Of course I've been wrong before.
The Sunrise building will always be at risk for something blocking it's views simply by it's location and the fact land is always redeveloped. There's never any guarantee of a view unless the land in front of that view can't be developed or redeveloped. In Vegas we once owned weeks at Polo Towers. Over time MGM built high rise hotel condo's behind it blocking the view of the valley and mountains to the east. There was also a deal in place to sell out the right of way in front of the building, which would have blocked the view of the strip for all owners. Fortunately there was an economic downturn and that deal died. However, it pointed out that views are never guaranteed unless there is no way something can be built that blocks a view, such as being the building right on the edge of the ocean.