In an EB-5 investment, the US immigration rules state that upon the approval of the I-526 petition the investor and family members can then apply for conditional permanent residency for a period of two years.The basis for the conditions is that the USCIS EB-5 unit in two years when the investor files a petition I-829 to remove the conditions, has to prove the investment funds were committed and the required jobs were created.
A Conditional Green Card is the Green Card you are given during the 2 year time period of your Conditional Residency after your I-526 Petition is approved before you file for the I-829 Removal of Conditions. Just like the title says, it is conditional and subject to the completion of other requirements.
A Conditional Green Card is for 2 years and is granted upon approval of your I-526 application and Green Card processing through Immigration in the US or visa processing through a US consulate. The condition is removable by an I-829 application filed in the last 3 months of your 2 year Green Card.