Neighbour requesting change of use to Serviced Apartment :(

Can anyone give me advice? I have just received letter from council notifying me that the owner of the penthouse which occupies the floor space directly above me, has requested a ‘change of use to serviced apartment’ for his property. Our building is purely residential, and when I bought in the building only 3 months ago, I was told that there was a restriction of a minimum  of 12 week rental for any of the apartments. I took this to mean that there would be no short term rentals in the building so no party flats! This was a large part of the appeal of purchasing in this building. Interestingly, the owner of the penthouse is a developer who is currently  developing the site adjacent to our building- a development which will effectively obliterate many of our building’s residents views, except his, as the new development is 1 storey less than his penthouse-what a coincidence! I only have 10 more days to submit my objection so hoping for some quick help – can I  object on legal grounds? What are the planning laws on ‘change of use to serviced apartments’?