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Notes on underwriting

Arguments rather than definitions — the modelling mistakes that recur, and what they cost. Every figure is one the software computes.

  1. Free rent does not shorten the lease

    Three months free on a five-year term is a 63-month cycle, not a 60-month one — and models get this backwards.

  2. An anchor worth 49% of the rent can take 61% of it

    Co-tenancy clauses mean losing one tenant does not cost you one tenant's rent.

  3. The four tests a lender runs, and the order they run them in

    DSCR, debt yield, LTV and break-even occupancy answer different questions. Passing one says nothing about the others.

  4. Lease expiries stack, and the year they stack in is the risk

    A rent roll with a healthy average term can still have two thirds of its income expiring in one year.

  5. Loss to lease is not upside until somebody signs

    The gap between in-place rent and market rent is worth what your expiry schedule lets you collect — which is usually much less.

  6. Percentage rent: the breakpoint decides whether you ever see any

    A 6% clause on a tenant below its breakpoint pays exactly nothing, and most models do not check.

Notes on Underwriting | DealWise AI Blog