^ Agreed, the close surroundings are not very inviting.
That said, the couple of high-rise buildings they built on that spot is encompassed in a larger new district, something like 800 acres.
It is called Euroméditerranée. This is what it looked like in late 2023.
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https://mesinfos.fr/13000-marseille/...-1-187303.html
They started to plan this whole thing 30 years ago and it's close to be complete today.
It was meant to convert a set of old warehouses into offices and to redevelop brownfields.
Now that the area assigned to the masterplan was almost entirely redeveloped, they're going to expand it, talking about 400+ additional acres.
As for those 2 elevated roads mentioned in the post above, I can't tell whether they could tear them down to replace them by any better infrastructure. Certainly not in a short run.
The new district is mixed-use. I believe there's quite a lot of recent residences. It may include a couple of venues for entertainment, but I think it was primarily planned to be appealing to businesses, so I don't know whether there's been much leisure over the spot yet.
A seawalk would be nice, but the area doesn't seem suitable. As you can see in the picture, there's still an active port nearby, so it's more like docks than beaches, lol.
Downtown Marseille shouldn't try too hard to be Nice anyway. It is bigger and supposed to widely be a trade port city to serve the French Med coast, not a seaside resort.