Definition
A base case is an underwriting scenario that models the most likely outcome for a real estate investment using reasonable, evidence-based assumptions. It is the anchor scenario used to value the deal, set return expectations, and compare alternative scenarios like downside and upside.
What the Base Case Includes
A complete base case typically covers assumptions across the business plan and hold period:
- Revenue: in-place rents, market rent growth, renewal increases, concessions, other income.
- Occupancy: physical/economic occupancy, turnover, downtime, lease-up pace (if applicable).
- Collections: delinquency and bad debt consistent with the tenant profile and history.
- Expenses: payroll, utilities, repairs, insurance, taxes, contracts, and admin with realistic inflation.
- Capex: renovation scope, unit turn costs, timing, and contingency.
- Financing: rate, amortization, IO period, reserves, covenants, and refinance assumptions (if modeled).
- Exit: exit cap rate, selling costs, and timing assumptions consistent with market liquidity.
Why It Matters
The base case is where you should be able to say: “If nothing breaks and we execute competently, this is the outcome.†Investors use the base case to price risk, size leverage, determine reserves, and avoid paying for optimism.
How Investors Use the Base Case
- Pricing discipline: anchor valuation to what is most likely, not what is possible.
- Return underwriting: evaluate IRR, equity multiple, cash-on-cash, and risk-adjusted returns.
- Execution plan: translate assumptions into operational goals (turn pace, leasing targets, expense controls).
- Scenario comparisons: measure how far outcomes move under upside/downside assumptions.
- Lender alignment: confirm DSCR and covenant compliance under realistic operations.
Example (Conceptual)
In a base case for a value-add multifamily deal, you might assume:
- Renovations occur at a realistic pace based on contractor and leasing capacity
- Rent premiums are supported by comps and achievable amenities/finish level
- Occupancy remains stable with modest disruption during construction
- Insurance and taxes reflect current quotes/assessments plus conservative inflation
- Exit cap rate includes a buffer (not the most optimistic pricing environment)
Common Pitfalls
- Smuggling upside into base: assuming top-of-market rents, perfect lease-up, and tight exit pricing.
- Ignoring second-order costs: renovations increase turns, staffing needs, and make-ready expense.
- Understating “lumpy†expenses: insurance, taxes, and utilities can jump unexpectedly.
- Overconfident timelines: delays in permits, contractors, or leasing can materially reduce returns.