I a BP needed, then it would be $3500. if you choose to invest in a regional plan ($800k), the regional center will provide you with the business plan and other nesessory project documents.
If you want to direct investment ($1.8M), then you will need to set up a business entity fee.
Filing Fee for I-526 : $3675
Filing Fee for I-485 : $1140
Filing Fee for AOS : $445
Filing Fee for I-829 : $3750
Biometric Fee: each person $85
Administration fees range from $50,000 to $70,000 depending on the Regional Center.