What is the fine-grained topic of the following text: Eduardo Maynau, delegate of Red Eléctrica de España in the Balearic Islands, and José Hila, Mayor of the city of Palma, have signed an agreement to renovate the Aljub exhibition hall of the Casal de Solleric which has been closed for a year due to accessibility and security issues. Only return the topic.
Renovation of Aljub Exhibition Hall in Casal de Solleric