The ADS PDKs are directly available for download at the TowerJazz PDK portal. If you are not yet a registered TowerJazz customer, please go to http://www.towerjazz.com/contact-us.html
SBC18 (SiGe BiCMOS 0.18 um) vs SBC35 (SiGe BiCMOS 0.35 um) but there are different flavours of each with different Ft/Fmax specs, see Foundry Partners - TowerJazz for brief information. TowerJazz would supply you with all the appropriate technical details once you have signed the appropriate NDA.