Hi Trent,
HVAC, Duct work, proper insulation, ensuring the new remodel is code compliant which will impact long terms market value.
Wesley
Cape Design Build
Www.capedesignbuild.com
Biggest x factor is to have a good set of wet sealed plans to obtain a permit.
Most basement expansions done in San Francisco require not just insulation and framing, but also electrical, plumbing and flooring upgrades.