A rough calculation
1M @ 2.5% = $25,000
400K @ 1.8% = $7,200
600K @ 5% = $30,000
= $62,200
Assume 5%/4% rule
$62,200 * 4%/5% = $49,760
$49,760 -25% (taxes) = $37,320 or $3,000 per month
Yes you can do it. The real question is, Can your life style shrink to fit this new amount of income...