For owners, operators and sponsors
Train your desk's judgment before it touches your equity.
Your analysts can build the model. What they can't do yet is spot the trap hiding in it: the rollover cliff, the loan that won't refinance, the partner who stops funding. Grindstone puts them through real deal decisions with a coach that pushes back, so the mistakes happen in practice instead of in your fund.
The problem
Modeling skill isn't deal judgment
Partner hours spent on basics
Every review cycle you catch the same missed assumptions. That is your most expensive time spent teaching.
Clean models, weak calls
A polished spreadsheet can hide a bad premise. Juniors rarely know which input the whole deal rests on.
Cycles they haven't lived
Most of your team has never worked through a credit freeze or a supply wave. Reading about one isn't the same.
How it works
Four rings of judgment
Each case is a real decision point. Your people make the call, defend it to the coach, and build a record you can see across the four rings.
For the first time, judgment development is not something you feel vaguely over years. It is something you can see: where you started in Month 1, where you are now, where the gaps are, and what to do about them next.
Judgment Profile · Four Rings
Current score, measured against your Month 1 baseline
In a cyclical, highly leveraged industry where single decisions run to nine figures, a team without refined judgment is an operational liability. The firms that build that judgment in their people first will spend the next decade outcompeting the ones that don’t. Grindstone exists to make your firm one of them.
Grindstone tracks each team member’s progress across the four rings with every case they complete. For the first time, you don’t have to rely on a vague sense, built up over years, of who is ready for more responsibility. You can see it: where each person started in Month 1, where they are now, where their gaps are, and what to work on next.
Ring I – Hover a ring
Analytical Judgment
Evaluating AI-generated underwriting. Catching plausible-sounding errors. Recognizing structural fragility before it surfaces in committee.
- –Interrogating exit cap assumptions against current basis
- –Identifying mis-specified rent growth in clean-looking models
- –Pressure-testing capital stack waterfalls under stress
- –Interrogating a proforma the way a senior partner would, not accepting the sponsor's assumptions at face value
- –Stress-testing rent growth, exit cap, and capex reserves against historical downturns, not just the forward curve
- –Spotting the single assumption the deal cannot survive being wrong about, and naming it before the committee does
- –Calibrating confidence: knowing when the model is robust, when it is fragile, and when you are guessing
Inside a session: no math, no modeling. All judgment.
Ask the Coach
A senior practitioner on call for every seat
Your juniors can ask any commercial real estate question, any time, instead of queuing it for your next review. The coach answers with their own record in view, draws live panels to show the math, and pushes them to reason it through rather than handing over a conclusion. Unlimited sessions, included with every seat.
You
My anchor rolls in year 3. How bad does the reserve have to get before the deal stops covering debt service?
Private coach
Here is the roll year on the grid. Change the highlighted reserve amounts and watch the bottom line; year 3 is already a hair under coverage.
Type in the amber cells and every derived line recalculates.
| Line | Yr 1 | Yr 2 | Yr 3 | Yr 4 |
|---|---|---|---|---|
| Effective gross income | 4,120 | 4,244 | 4,371 | 4,502 |
| Operating expenses | (1,648) | (1,698) | (1,749) | (1,801) |
| Net operating income | 2,472 | 2,546 | 2,622 | 2,701 |
| TI and LC reserve | ||||
| Debt service | (1,704) | (1,704) | (1,704) | (1,704) |
| Cash flow after debt | 588 | 662 | 738 | 817 |
Push the roll-year reserve past about 900 and coverage breaks. So the real question is not the cap rate; it is who funds that year and on what terms.
Live Deal Mirror
A second look before IC
Describe a deal you're working on and get a briefing that surfaces blind spots across all four rings and the questions a skeptical committee would ask. Included with every seat.
Office · Suburban Atlanta · LOI
Acquisition of an $80MM suburban Atlanta anchor-heavy office asset facing significant binary renewal risk within the initial hold period.
Press on these before you commit
- 1What is the specific 'replacement cost vs. current basis' delta, and would a competitor building offer these anchors a 'new-build' package for the same effective rent?
- 2If both anchors vacate in year 3, what is the specific cash-on-cash requirement (including TIs/LCs/Carry) to achieve 85% occupancy again, and does the $80MM entry price allow for that capital call?
- 3What is the 'weighted average commute' for the anchors' key decision-makers, and has there been any recent change in their corporate office-attendance policy?
- 4Do we have a firm debt quote that accounts for the 3-year roll, or will the financing include a 'cash sweep' triggered by tenant non-renewal?
Most relevant cases
Reviewing an AI-built office model with uniform renewal assumptions
This case directly addresses the danger of relying on high-level occupancy and cap rate metrics in suburban office assets without interrogating the underlying lease stability.
Lessons
- Audit the 'shadow' vacancy or termination rights that AI-generated or associate-level models often overlook in suburban office assets.
- Scrutinize the probability of renewal vs. relocation for suburban tenants based on specific floorplate utility and commute patterns.
Risks surfaced
- Overestimating net effective rent by failing to account for massive TIs required to backfill large blocks.
- Underwriting a 'stabilized' cap rate on what is effectively a bridge-to-re-leasing play.
Custom firm cases
Onboard every new class on your own deal lessons
Every firm has the deals it still talks about: the one that almost broke the fund, the refinance that saved it, the partner call that changed how you underwrite. Turn those into private cases only your team can see, so each incoming class of analysts works through your most important lessons in their first weeks instead of learning them the hard way.
Tell us the deal
Share the story and the decision that mattered. Disguise names and figures if you want, or keep them real.
We build the case
It becomes a coached case on the right ring, with the traps your seniors want new hires to catch.
Every class works it
New analysts make the call and defend it. You see who spotted the lesson and who needs a conversation.
Private to your firm. Never added to the public library.
The math
$7,500 a year for 5 people
Extra seats are $1,500 each. That is less than one missed diligence issue usually costs, and far less than the partner time you spend catching it.
Firm plan
Build judgment across the desk
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Questions
Can I move a seat when someone leaves?
Yes. You invite people by email and can remove and reassign seats anytime during the year.
Does it renew automatically?
No. It is one payment for one year. You choose whether to renew.
Will the coach just give my team the answers?
No. It asks questions and challenges reasoning. It never writes the memo or makes the call for them.
Who sees our custom cases?
Only people on your team. Custom cases stay private to your firm and are never added to the public library.
We need more than a handful of seats.
Add seats at checkout, or write to bkirsch@getrefm.com for larger teams.
A short email series on sharpening your deal judgment.