Real Estate Investment Trust Modernization Act of 1999

Amends title XIX (Medicaid) of the Social Security Act to prohibit the imposition of Medicaid home liens and Medicaid estate recovery for long-term care services in the case of an individual who has received benefits under a qualified long-term care insurance policy for at least three years during the five-year period ending on the date of provision of such services. Amends the Internal Revenue Code to: (1) repeal the inclusion in an employee's gross income of employer-provided coverage (through a flexible spending or similar arrangement (FSA)) of qualified long-term care services; (2) allow the carryover of amounts in excess of the maximum amount of reimbursement under an FSA; and (3) exclude from gross income the reimbursement of long-term care insurance premiums by FSAs (as well as the reimbursement of health insurance premiums during unemployment).