What if I lost my green card and it is also expired? Would I be renewing or replacing? (I-90)

Renew a lost and expired green card.

You should choose the best option depending on your situation. However, the USCIS states that if you file for a replacement 10-year green card, you will receive one with a new expiration date. CITATION: Pg. 101 http://www.uscis.gov/sites/default/files/USCIS/About%20Us/Electronic%20Reading%20Room/Customer%20Service%20Reference%20Guide/Permanent-Residents4-3.pdf