An office building analysis shows 120,000 SF of space was absorbed last year in a submarket with 50,000 SF currently available. If no new construction is planned, what is the absorption period for existing inventory?
Correct Answer
C) 5.0 months
Why this is correct: Absorption period estimates how long it would take to lease/sell the current available inventory at the current absorption rate. First, find the monthly absorption rate: 120,000 SF absorbed in 12 months = 10,000 SF/month. Then, divide available inventory by monthly rate: 50,000 SF ÷ 10,000 SF/month = 5.0 months. Why the other choices are wrong: "2.4 months" might come from 120,000/50,000 = 2.4, which inverts the formula. "6.0 months" could result from using annual absorption directly (50,000/120,000 = 0.4167 years ≈ 5 months) but mis-converted. "10.0 months" might come from 50,000/5,000 (if monthly rate was miscalculated as 5,000). Exam tip: Absorption period = current available inventory ÷ monthly absorption rate. Always convert annual absorption to monthly first.
Why This Is the Correct Answer
Option B is correct because it properly applies the two-step absorption period calculation. First, the annual absorption of 120,000 SF is divided by 12 months to get a monthly absorption rate of 10,000 SF per month. Then, the current available inventory of 50,000 SF is divided by this monthly rate (50,000 ÷ 10,000 = 5.0 months). This calculation assumes the historical absorption rate will continue into the future, which is a standard assumption in market analysis.
Why the Other Options Are Wrong
Option A: 2.4 months
Option A incorrectly calculates 2.4 months, likely by dividing 120,000 by 50,000 and then somehow arriving at this figure through mathematical error or misunderstanding of the formula sequence.
Option B: 6.0 months
Option B shows 6.0 months, which might result from incorrectly using a 10-month year instead of 12 months, or making an error in the division calculation.
Option D: 10.0 months
Option D shows 10.0 months, which appears to result from dividing 50,000 by 5,000 (using a 24-month divisor instead of 12) or some other fundamental calculation error.
AAA Formula - Annual, Available, Absorption
Remember 'AAA': Annual absorption ÷ 12 = monthly rate, then Available space ÷ monthly rate = Absorption period. Think 'Triple-A rating' - you need all three components in the right order.
How to use: When you see absorption period questions, immediately identify the three AAA components: Annual absorption rate, Available inventory, and calculate Absorption period using the two-step division process.
Exam Tip
Always convert annual absorption to monthly first (÷12), then divide available space by monthly absorption rate - don't try to do it in one step as this leads to calculation errors.
Common Mistakes to Avoid
- -Forgetting to convert annual absorption to monthly rate
- -Dividing in the wrong order (absorption by available space)
- -Using gross absorption instead of net absorption figures
Concept Deep Dive
Analysis
This question tests understanding of absorption analysis, a critical component of market analysis in commercial real estate appraisal. Absorption analysis measures how quickly vacant space in a market is leased or occupied, providing insight into market demand and supply dynamics. The absorption period calculation helps appraisers assess market conditions and forecast how long it will take for current inventory to be absorbed at historical rates. This metric is essential for determining market stability, rental rate trends, and overall market health in the income approach to valuation.
Background Knowledge
Absorption analysis requires understanding that absorption rate measures the net change in occupied space over a specific time period, typically expressed annually but converted to monthly rates for period calculations. The absorption period formula is: Available Space ÷ (Annual Absorption ÷ 12 months) = Months to absorb current inventory.
Real-World Application
Appraisers use absorption analysis to advise clients on market timing for new developments, to support highest and best use conclusions, and to forecast stabilization periods for income-producing properties in feasibility studies.
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