Politico reports the federal government "spent nearly $3.7 million on former presidents last year. That covers a $200,000 pension, compensation and benefits for office staff, and other costs like travel, office space and postage."
"The costliest former president? George W. Bush, who clocked in at just over $1.3 million. That includes almost $400,000 for 8,000 square feet of office space and $85,000 in telephone costs."