The Blanket-Policy Problem: Why You Can't Tell a Tenant What Their Building Costs

If you own a portfolio, you've probably lived this one. Your broker put twenty properties on a single blanket policy, the renewal comes back as one lump premium, and now you have no clean way to tell a tenant (or a lender, or your own accountant) what their specific building costs to insure for the year. On a net lease where the tenant reimburses insurance, that's not a minor annoyance. It's a recurring fight.

Why blanket policies create this mess

Blanket policies are genuinely useful. They can be cheaper, simpler to manage, and they let limits float across locations. The problem isn't the coverage. It's the billing. The carrier rates the whole schedule and hands you one number, with no line that says "123 Main Street: $X." So when a tenant asks what they're reimbursing you for this year, which is a completely fair question under an NN or NNN lease, you're stuck. You either guess, split it evenly (wrong and unfair), or dig through the carrier's rating worksheet by hand.

Splitting it evenly is the trap most people fall into. A 6,000 SF masonry building in a quiet inland market does not cost the same to insure as a 6,000 SF building in a coastal wind zone or one with an aging roof. Divide the blanket premium equally and you overcharge your good buildings and undercharge your risky ones. Any tenant who compares notes with another will notice.

How proper allocation works

The defensible way to break a blanket premium down to each property is to allocate by each building's share of the total insured value (TIV), then adjust for the factors that actually drive a building's rate. In plain terms:

1. Start with each property's insured value (replacement cost).
2. Work out its share of the portfolio's total insured value.
3. Apply that share to the blanket premium as a baseline.
4. Adjust for property-specific risk, like wind/hail zone, construction type, roof age, and loss history, so a coastal or older building carries its fair weight instead of hiding inside the average.

What you end up with is a per-property number you can actually defend: here's your building, here's the coverage, here's the annual cost, here's the basis. That's something a tenant will accept and a lender will respect.

Why this is a real edge, not just bookkeeping

For a CRE investor, clean per-property allocation solves problems that ripple across the whole operation:

• Tenant reimbursements become transparent and dispute-free.
• Lease pass-throughs and CAM reconciliations get easier and more accurate.
• Underwriting your next acquisition is cleaner, because you actually know what each asset costs.
• Selling a property is smoother when you can hand a buyer a clean insurance cost for that specific asset.

Most brokers don't do this well because it's tedious, and their systems are built policy-first, not property-first. But it's exactly the kind of thing that separates insurance being a black box from being a line item you actually control.

How we think about it

We treat every property as its own object, with its own insured value, its own risk profile, and its own allocated cost, even when it's sitting on a blanket policy. That's what lets us hand you (and your tenants) a clean, defensible per-building number instead of a lump sum nobody can pull apart.

Related reading: Replacement Cost vs Actual Cash Value · NN vs NNN vs Absolute Net

This article is general education, not insurance or legal advice. Coverage terms vary by policy, carrier, and jurisdiction.