Real estate lenders use guaranties to carve out certain acts from non-recourse liability and hold borrowers and principals liable in certain cases in which collateral value has decreased. This article discusses CSFB 2001-CP-4 Princeton Park Corporate Center, LLC v SB Rental I, LLC, a New Jersey appellate court decision that upheld the enforceability of a non-recourse carve-out provision making the loan fully recourse if the borrower placed a junior financing lien against the mortgaged property.