I'll get right to it. I've been evaluating tower sites and edge data center locations for seven years, and I've made enough mistakes to fill a small textbook. Actually, not a textbook—a cautionary tale. Roughly $340K in wasted budget across my first 18 months, between engineering fees on sites that never worked, lease-break penalties, and a very expensive connector mismatch.

This checklist is what remains after all of that. It's for anyone evaluating a tower lease, a rooftop installation, or a smaller edge data center site. If you're doing hyperscale campuses or rural macro towers with no fiber within a mile, some of this won't apply—I'll flag that at the end.

Seven steps, in the order they've cost me money.

Step 1: Structural capacity before you get attached

In 2018, I found a rooftop site in northern New Jersey that looked like a slam dunk. Strong coverage gap, cooperative building owner, reasonable rent. I pushed it straight to engineering without doing the preliminary homework.

Turned out the roof couldn't handle the wind load of the proposed antenna configuration. The structural engineer's report rated the site at C300—enough for a modest single-operator setup, not the multi-operator array the coverage plan required. $28K in engineering fees, gone. You can't negotiate with physics.

Checkpoint: Before you invest serious money, get a preliminary structural feasibility scan. It's a few thousand dollars. It stops you from falling for a site that structurally can't deliver.

Step 2: Verify fiber backhaul—including the connectors

"Fiber available in the area" is a red flag phrase. "Fiber available at the building" is what you actually want. I learned that in September 2022 when I recommended a site that was 400 meters from the nearest splice point—across a municipal right-of-way with no permit in place. Eight-week delay.

And since a lot of people ask: what is a connector? In telecom infrastructure, a connector is the physical interface that joins fiber optic cables to each other or to equipment. The most common types are LC and SC. LC is small, common in data centers. SC is bulkier, all over older installations.

I once ordered a full equipment set terminated with one connector type, only to discover on commissioning day that the building's existing fiber plant used a different one. The conversion hardware cost around $8K plus two weeks of schedule. All because nobody asked one question: what's on the other end of the fiber?

Checkpoint: Ask the fiber provider for their termination type. Ask your equipment vendor what your gear expects. If they don't match, you need a plan before you order—not after.

Step 3: Benchmark the lease escalation clause

My first lease approval had a 2% annual escalator. I remember feeling proud when I signed it. A year later, a colleague mentioned their comparable site had a 1.5% escalator. I went back to my contract and realized I hadn't benchmarked anything. That minor oversight added up to roughly $47K in unnecessary rent over a 10-year term.

The mistake wasn't signing the lease. It was signing it without comparing the escalation structure to the market.

Checkpoint: Model three escalation scenarios—flat, CPI-based, and stepped—and benchmark against at least three comparable sites before you sign anything with a multi-year term.

Step 4: Check zoning and permitting before you commit

In that same cursed month of September 2022, I signed a lease for a property that seemed perfect. Commercial zoning, motivated landlord, fair price. Then I found a municipal ordinance requiring a special permit for any external antenna within 500 feet of residential zones. The process was a 6-to-9-month slog with no guaranteed approval. We paid $12K to walk away.

Per FCC regulations, antenna structures over 200 feet—or those near airports—need to be registered under 47 CFR Part 17. But local zoning is a separate, often more painful layer. I should have run the municipal code check before signing, not after.

Checkpoint: Have a land-use consultant run a zoning search before any lease commitment. Look for antenna placement restrictions, height limits, setback rules, and special permit processes.

Step 5: ESG expectations are part of site selection now

ESG requirements are no longer a buzzword overlay—they're baked into how tenants and landlords evaluate deals. American Tower's ESG commitment 2025, for example, includes specific targets for reducing carbon intensity and expanding renewable energy procurement. Those commitments affect what gets approved at the site level.

(Should mention: I'm talking about the practical stuff—energy efficiency reporting, renewable credits, community impact assessments. If you're leasing to a major carrier or tower operator, expect to be asked for your energy data.)

Checkpoint: Ask upfront what ESG reporting will be required. Get the templates if they exist. If you can't produce basic energy usage numbers, some deals simply won't move forward.

Step 6: Stress-test the financials—yours and your counterparty's

When American Tower announced it would acquire CoreSite for $10.1 billion, the thesis was clear: edge data centers are the connective tissue between macro towers and enterprise networks. But that deal also changed the balance sheet math.

Post-acquisition, American Tower's leverage landed around 7.1x net debt to EBITDA. That's reasonable for a REIT with their cash flow profile—not a red flag. But it shapes how they underwrite deals. When a counterparty carries more leverage, renewal terms, capex decisions, and site consolidation all look different.

Checkpoint: In your financial model, stress-test with realistic assumptions for churn probability, escalators, power costs, and maintenance capex. And understand who's sitting across the table from you.

Step 7: Walk the site at 2:00 AM

Not a joke. The site I recommended in 2020 looked perfectly secure during my 10 AM site visit. At 2 AM, it was a different story. Broken perimeter gate. Accessible equipment cabinet. A lock that could be opened with a screwdriver.

Security doesn't show up during business hours. You need to see the site when nobody's watching.

Checkpoint: Visit at night. Check fencing, camera coverage, lighting, lock types. Ask about police response time in the area. This is the step everyone skips, and it's the one most likely to save you from having a conversation you don't want to have with leadership.

Final caveats

This checklist works for standard tower, rooftop, and edge data center evaluations. Some honest boundaries:

  • Hyperscale data centers—a completely different risk profile. Power and water availability dominate. Connectors and municipal permits are secondary.
  • Rural macro towers with no nearby fiber—you're solving another problem. Fixed wireless or satellite backhaul changes the whole math.
  • Leases under three years—some of these checks aren't worth the diligence cost for a short-term deal. Use judgment.

One admission: I've never fully understood why municipal permitting timelines vary so wildly between towns. Same state, same application type, same documents. Three weeks in one jurisdiction, 11 months in another. If you've figured out why, I'd genuinely love to hear it.

That's the checklist. Seven steps, each born from a specific mistake I'm not proud of. Make fewer mistakes than I did.

Technical planning note: validate insertion loss dB, PIM dBc, grounding resistance, and relevant 3GPP TS 38.xxx requirements before final RAN acceptance.