Built on the same Archer engine. Designed to run a clean deal in minutes — and built to become your firm's own.
B.Y.O.M. has been one of the most loved capabilities Archer has ever shipped.
Bring your firm's underwriting model. Archer's engine snaps in. Parsing, comps, tax estimates, benchmarks, property data — all of the input work your team used to spend hours on now lands in your model automatically. Your calculations and outputs stay exactly as they are. Your team's edge stays exactly where it lives — in the judgment, not the data assembly.
The teams running BYOM today move faster than they've ever moved. Same model their firm trusts. Same outputs their stakeholders know. Just hours of manual input work removed from every deal.
Today, we're extending those same superpowers to a model Archer built.
Archer's 2.0 Model — Starter+ is a complete multifamily underwriting model that's wired to Archer's data engine from the moment you open it, and structured so you can take it apart and rebuild it as your firm's own.
Explore it here: Archer — Starter Model + BYOM
For teams that want to put Archer's automation to work right now — without the lift of bringing or building their own model first — Starter+ closes the gap between Archer's engine and a model that's ready on day one.
Archer's design has always centered on a single insight: every underwriting model has three layers — Inputs, Calculations, Outputs — and the slowest part for every team is Inputs. Parsing rent rolls. Pulling comps. Researching taxes. Setting growth rates. The judgment work — the calculations and outputs — is where your team's edge lives.
Today, our clients have two paths to put that insight to work:
BYOM — Bring Your Own Model. Your bike. We add the motor. Bring your existing Excel model. Archer's engine automates all your inputs — parsing, comps, benchmarks, property data, tax estimates — while your calculations and outputs stay completely untouched. The fastest path for teams who already have a model their firm trusts.
Starter+ — Fully built. Fully customizable. A complete multifamily model with the same Archer engine built in. Pre-built calculations and outputs that you can use as-is, or adapt to match your process. Once customized, it becomes your own model — powered by Archer.
Both paths share the same engine. The same parsing. The same comp set, tax estimates, and growth rate benchmarks. The same Custom Chart of Accounts. The same data flywheel writing back to your private cloud. What changes is who provides the calculations and outputs — Archer, or you.
Starter+ is a real underwriting model. Not a screening template, not a quick-look spreadsheet — a complete multifamily underwriting tool.
Annual pro forma. Full chart of accounts. Up to three loans plus refinance, each with I/O period, amortization, DSCR and LTV constraints. Renovation modeling with month-by-month schedule, ROC, and renovation IRR. IRR-based or equity-multiple waterfall with four hurdle tiers. Sensitivities on price, rent, reno cost, exit cap, hold period. A full set of one-pager outputs — Investment Summary, Property CF, Equity CF, Sources & Uses, Sensitivities — formatted to drop directly into an IC memo.
Live returns are visible right on the Setup tab. Levered IRR, Equity Multiple, Cash-on-Cash — all updating as you adjust assumptions. No clicking through to find your headline numbers.
Underneath, the model is wired into the same Archer infrastructure that powers everything else. Open Starter+ for any property and your name, address, Archer ID, parsed rent roll, and parsed T12 are already populated. Your comps are one click away. Tax estimates auto-populate. Growth rate defaults pull from comp-based market data. The model looks like a quiet, lightweight Excel file on your desktop, but it's connected to Archer's brain.
The most important thing to understand about Starter+ is how it's wired internally.
Most underwriting models are tangled. Outputs link back to assumptions. Assumptions link to calcs. One tab can pull from anywhere. Change the waterfall and the executive summary breaks. Add a row to the chart of accounts and three downstream tabs error out. We've spent enough time inside enough firms' models to know this is the rule, not the exception.
Starter+ is built the opposite way. Data only flows downstream:
Inputs → Calculations → Outputs.
Nothing runs backward. Output tabs are terminal — they pull from upstream and feed nothing. Which means you can replace any output without affecting any calculation. Don't like our IC summary? Delete it, drop in your firm's. Need to plug in your own waterfall? Replace the Waterfall tab and pull from Cash Flow after Debt Service. Want to swap our debt module for your own? Same idea.
In Excel, this shows up visually: green tabs are the Archer engine — the parsing pipeline, the comps, the data connector — maintained centrally and updated for every client at the same time. Amber tabs are yours to customize — the calculations and outputs that turn raw data into your firm's perspective on a deal. Use them as-is, or rewrite them to match your process.
This is what we mean when we say it's a chassis. The inputs and the calculations are the engine. Everything else is yours to take apart.
When you're ready, upload your customized version as your firm's BYOM template. From that point on, every deal you run through Archer populates your model — your COA, your outputs, your waterfall — with parsed financials, comps, and tax estimates. +BYOM in the name is exactly that: the upgrade from using our model to making it yours.
Starter+ is designed for four kinds of teams.
Teams without a model. Get to a working underwriting model on day one. Archer Starter+ runs a complete deal out of the box, with the data engine already wired in. Customize what your firm cares about, leave the rest as-is. When you're ready, upload your version as your firm's BYOM template.
Teams whose model is still in progress. Run real deals while your firm's model evolves. The work you've already done isn't wasted — it becomes the override layer on top of Starter+'s chassis as you bring your pieces in.
Teams who want to build on Archer's model. You like Archer's calculations but want your firm's outputs and a few tweaks to the calcs. Start with Starter+, customize the amber tabs to match your process, and the engine underneath keeps everything connected.
Teams who want a simpler model to start with. A clean, readable Excel file with the data engine already wired in. Run a deal in ten minutes. Add complexity only where you actually need it.
We've started thinking about Starter+ the way modern software companies think about developer kits.
Every category that's been transformed by software follows the same arc. Powerful tools start out fragmented and hard. Then someone ships the toolkit — the foundation that everyone builds on top of, with components you can compose, swap, and extend without rebuilding from scratch. Once that foundation lands, the conversation stops being "which tool" and starts being "which components."
CRE underwriting hasn't had that toolkit. Models have been one-shot artifacts: opaque, monolithic, brittle to change.
Starter+ is the first piece of a different shape. The data engine, the parsing pipeline, the comp set, and the calculation logic are the components. The waterfall, the IC summary, the renovation block, the debt module — those are pieces you can take, leave, or replace with your own. Over time, more of these will be selectable as a true component library: pick the renovation logic you like, drop in the waterfall structure your LP expects, connect your firm's IC format. The model becomes the assembly of the components your team actually wants.
This is also where it starts to compound. The longer your team works on top of Starter+, the more your model carries the calculations, formats, and standards your firm trusts — without losing the data automation underneath.
Which path you take has nothing to do with whether your deal data flywheel is working.
Every rent roll you parse becomes a rent comp in your private dataset. Every T12 becomes an expense comp. Every underwrite gets parsed, structured, and stored back in your Archer Private Cloud for future use. Same data engine, same private cloud, same compounding intelligence layer for your team — regardless of whether you're running BYOM or Starter+.
The model is just where you do the work. The flywheel is the same underneath.
Existing Archer clients — Starter+ is available now. Start using it today!
New to Archer — the fastest way to see this in action is to send us a deal. One rent roll, one T12 — we'll parse it live, generate Starter+ populated with your data, and you'll see in ten minutes whether this is the workflow your team has been looking for.