What Is Market Rent
Market rent is the monthly or annual rental rate a property would command if leased to a tenant today, based on comparable rental properties in the same geographic area and market condition. Assessors use market rent to calculate the income approach valuation, which directly impacts your property tax assessment.
The key distinction: market rent differs from your actual lease. If you signed a five-year lease at $2,500/month three years ago, your contract rent remains $2,500. But if similar properties now rent for $3,100/month, the assessor may use $3,100 as market rent when valuing your property for tax purposes. This gap between contract rent and market rent is where many property owners find inflated assessments.
How Assessors Determine Market Rent
Assessors typically identify market rent by analyzing comparable rental properties (comps). They gather data from:
- Active lease listings and recently signed leases in your neighborhood
- Tenant lease databases and commercial real estate services (CoStar, LoopNet for commercial properties)
- Rental surveys conducted by local appraisal organizations
- Adjustment factors for unit size, age, location, and amenities
For income-producing properties, the assessment ratio in most states ranges from 30 to 50 percent of appraised value. If an assessor uses inflated market rent, the resulting appraised value climbs, and so does your tax bill. In Illinois, for example, assessment ratios average 33.3 percent for commercial property, meaning a $100,000 overvaluation translates directly to $33,300 in additional assessed value.
Market Rent in Board of Review Appeals
When appealing your assessment at the board of review hearing, challenging the assessor's market rent estimate is often your strongest argument. You'll need comparable rental data that contradicts their assumptions.
Present evidence such as:
- Recent lease agreements for comparable units in the same building or neighborhood
- Signed leases showing rental rates lower than the assessor's figure
- Vacant unit listings that prove market weakness
- Expert appraisal reports applying the income approach with defensible rent data
- Tenant turnover rates or concessions (free rent, tenant improvements) that reduce effective rent
Board members respond to data. If the assessor assumed $4,000/month market rent but you provide three signed leases from comparable units at $3,650/month, you've established a credible lower figure. Document your comps carefully and be prepared to explain why they match your property's characteristics.
Common Questions
Should I use my current lease as market rent evidence?
Not directly. Your lease is contract rent, not market rent. However, if your lease is recent and competitive, it supports the case that the assessor's market rent figure is too high. If you're paying $2,500/month and the assessor assumed $3,200, your lease proves the market doesn't support their estimate. But if your lease is outdated or below-market, the assessor will discount it.
What if my building is mostly vacant or has high turnover?
Document it. Vacancy rates and tenant turnover directly affect true market-rent-producing ability. An assessor might assume 95 percent occupancy, but if your building averages 75 percent occupancy, that's a real financial factor. Some jurisdictions adjust market rent downward for chronic vacancy. Bring occupancy records and lease history to your appeal.
How recent should comparable rental data be?
Use data from the past 12 months whenever possible. The assessment date (typically January 1st in most states) is the snapshot date. Rental agreements signed within six months before and after that date carry the most weight. Older data becomes less relevant as market conditions shift.