Properties in Sitges are very expensive compared to other regions of Spain, which is probably due to its privileged location.
Sitges has 18 attractive beaches and coves, these are called: Les Botigues, Cala Ginesta, Garraf, Cala Morisca, Vallcarca, Aiguadolç, Balmins, Sant Sebastià, La Fragata, La Ribera, La Bassa Rodona, L'Estanyol, La Riera Xica, La Barra, Terramar, Les Anquines, L'Home Mort, Desenrrocada.
Cala Ginesta, Garraf, Aiguadolç also has marinas were you can practice all kinds of maritime sports.
If you are up to cultural experiences you can visit varios emblematic properties in Sitges like: The Palace of Maricel or the Church of San Bartolomé y Santa Tecla.
Has far as we know there are no illegal properties in Sitges, so it is save to buy a property there. Most of the properties in Sitges you will find are modern villas and apartments.