Tax Deductible Interest
  
See: Tax Deduction. See: Mortgage Deduction.
If you're a business and you have debt, the cost of renting that debt (the interest), is tax-deductible, just as is the cost of office space, insurance, and the little Keurig cups you have to keep buying for the shipping dock.
If you're an individual, the interest you pay on your mortgage is deductible, these days, up to the rent on $500,000 worth of that mortgage. So what does that mean? Well, if you had earned $100,000 that was taxable, and you had $15,000 in mortgage interest (like 5% on $300,000 borrowed), then as far as the IRS is concerned, you have taxable income of $85,000, not $100,000.
And you're saving meaningful dough in taxes. Essentially, the government is splitting the cost of renting that money so that you too can be part of the American Dream, with termites, yard work, and creaky floors.