Tenant security deposits and other restricted cash consist of the following (in thousands):  December 31, 2004 2003 Funds held in trust under the terms of certain secured notes payable $ 11,241 $ 8,665 Security deposit funds based on the terms of certain lease agreements 2,045 2,029 Other funds held in escrow 4,383 363 Total $ 17,669 $ 11,057 Secured debt as of December 31, 2004, consists of the following (dollars in thousands):  Tenant Security Deposits and Other Restricted Cash Secured Debt December 31, 2004 2003 Secured debt, interest rates varying from 3.69% to 8.71%, (weighted average effective interest rate of 6.12% and 7.06% at December 31, 2004 and 2003, respectively), maturity dates ranging from September 2005 to August 2021 $635,432 $ 319,755 Unamortized premiums 3,514 252 Total secured debt $638,946 $ 320,007 Our secured notes payable generally require monthly payments of principal and interest.The total book value of properties securing debt was $776,342,000 and $369,731,000 at December 31, 2004 and 2003, respectively. At December 31, 2004, our secured notes payable were comprised of $437.2 million and $201.7 million of fixed and variable rate debt, respectively, compared to $297.5 million and $22.5 mil- lion of fixed and variable rate debt, respectively, at December 31, 2003. The following is a summary of the scheduled principal payments for our secured debt and the weight- ed average interest rates as of December 31, 2004 (in thousands):  Weighted Average Year Amount  Interest Rate (1) 2005 $ 23,227 5.67% 2006 206,889 5.69% 2007 16,709 6.35% 2008 115,514 6.30% 2009 42,210 6.89% Thereafter 230,883 6.90% Subtotal 635,432 6.12% Unamortized premiums 3,514 Total secured debt $ 638,946 In December 2004,we amended our unsecured line of credit to increase our borrowing capacity from $440 million to $500 million. Borrowings under our unsecured line of credit, as amended, bear interest at a float- ing rate based on our election of either a LIBOR-based rate or the higher of the bank’s reference rate and the Federal Funds rate, plus 0.5%. For each LIBOR-based advance, we must elect a LIBOR period of one, two, three or six months.The unsecured line of credit expires December 2007 and may be extended at our sole option for an additional one-year period.As of December 31, 2004, we had borrowings of $298.0 mil- lion outstanding on the unsecured line of credit with a weighted average interest rate of 3.72%.  P 11 (1) The weighted average interest rate is calculated based on the outstanding debt as of January 1st of each year. Unsecured Line of Credit and Unsecured Term Loan