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Remote Work Real Estate

Case Interview Practice > 
Math

One option the client is considering is converting a portion of their office space into residential apartments. They’ve asked us to run the numbers on a 250,000 sq ft building in Charlotte, NC. Here are the assumptions:

  • Residential conversion cost: $200/sq ft
  • Expected monthly rent per unit: $2,000
  • Average unit size: 1,000 sq ft
  • Annual operating expenses: 30% of gross rent

How many years would it take for the client to recover the conversion cost?

Case Exhibit

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Sample answer from an expert consultant

Step 1: Conversion Cost

  • 250,000 sq ft × $200/sq ft = $50M

Step 2: Number of Units

  • 250,000 sq ft ÷ 1,000 sq ft/unit = 250 units

Step 3: Annual Gross Rent

  • $2,000/month × 250 units × 12 months = $6,000,000

Step 4: Net Income

  • $6M × (1 – 30%) = $4.2M/year

Step 5: Payback Period

  • $50M ÷ $4.2M ≈ 11.9 years

Answer: It would take approximately 12 years to recover the conversion cost.

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