Architecture is very subjective and opinion of same is very personal. I certainly don’t think that the said building is great by any means, in fact it’s not (got the windows wrong for starters!), but good modern architecture can and does have its place and can be successfully integrated along with the old. People forget - or don’t realise - that even the very oldest of buildings were modern when they were built. Do people really want all old towns to be living museums? Can you honestly say old is always good? I would say it certainly isn’t. Somewhere like Pollensa Town is very special though and great care should be taken. Don’t think ‘Planning’ is as strict as in the U.K.
The world, including Pollensa must move on. Sometimes difficult to grasp when you visit once or twice a year on holiday, but people also have to live / work there. Even though they may look ‘quaint’ many old buildings, often in countries like Spain, are literally dropping apart. You’ve all seen them I’m sure. Even the new ones are built to standards that are totally unacceptable in the U.K. (yes, I do understand the climate is different). They might look O.K. but structurally and in many other ways they are often not. If buying in Pollensa, in P.P. or anywhere else in Spain for that matter, remember the old saying - ‘caveat emptor’ - let the buyer beware.