I'd be surprised a $100K sale puts you in the top 20 percent capital gains bracket...that's taxable income before the $100K of well over $400K.
You may over the 3.8 percent Obamacare tax (that kicks in at $200K for singles and $250K for married taxpayers).
Note that if the $100K is depreciation recapture (more precisely unrecaptured Section 1250 gain), the tax return is 25 percent plus potentially the 3.8 percent Obamacare tax.
The ways to grind this down:
1. Avoid the 3.8 percent Obamacare tax (discussed here:
https://evergreensmallbusiness.com/real-estate-investors-net-investment-income-tax/ )
2. Use a like kind exchange to roll your gain into another real estate investment...
3. Shelter the gain with other deductions (E.g., bigger contributions to employer 401(k))
4. Try to use lower, even zero percent, tax brackets for the gain.
BTW, this is really situation specific, but sometimes folks use an installment sale to spread the gain out over more than one tax return/tax year. (E.g., you sell to your son or daughter, trust their credit, and work the low tax bracket angles.)