Investment Property Underwriting · South Florida

Know what a deal is really worth before you make the call.

Send me a South Florida property. I run it the way a buyer's bank will and send back a clean two-page report: the real rents, the Florida costs nobody lists, and the actual return. You make your move holding the real number, not the brochure's.

9:41FERINUS
1008 18th Ave N · Lake Worth
Quadplex · Buyer-side · No. 2026-005
Real cap
4.4%
Listed
$925k
County
$612k
This deal
Healthy
Treasury
Gross rent (verified)$80,640
County tax 2025$12,601
Last sale · 2018$435,000
Underwritten by Ferinus
Palm Beach
& South Florida focus
County‑sourced
Real tax, value & sales
Lender‑grade
The bank's own model
First free
Judge the work yourself
Why it matters

Every listing leads with its best number. The one that decides the deal is what a lender lands on after the costs nobody advertises.

A Lake Worth quad came to market implying a healthy return. Here is where it actually sits once Florida is priced in.

Cap rate · advertised vs. reality
Advertised on listing0%
A healthy rental here~5.0%
What it really runs0%
10-yr Treasury (riskless)~4.3%

At 4.4% it barely clears a riskless return. Not a scandal, just the gap that costs a buyer who never saw it coming.

What lands in your inbox

Two pages. Built to put on the table.

Plain enough to hand a client, tight enough to satisfy their bank. Every figure sourced, nothing padded.

  • 01

    Verified income

    Real market rents from live comps, by unit type. Not the listing's gross.

  • 02

    The true cost side

    Actual county tax, the reassessment that hits after a sale, wind insurance, vacancy, reserves.

  • 03

    The honest return

    Going-in cap, cash-on-cash, DSCR, and a five-year projection.

  • 04

    Financing scenarios

    New debt versus an assumable loan, side by side, when it swings the deal.

  • 05

    Red flags & levers

    What to watch, and the price or rent that actually makes it work.

1008 18th Ave N · Lake Worth Beach
Quadplex · Buyer-side underwriting · No. 2026-005
Going-in cap
4.4%
Listed at
$925k
County value
$612k
Gross annual rent (verified)$80,640
County tax (actual 2025)$12,601
Last arm's-length sale$435,000 · 2018
Ask over county value+$313,000
How it works

You send a listing. I send back the real math.

Nothing to learn, nothing to assemble. The work is on me.

01

Send a property

A link or an address for any small multifamily you're working. One line does it.

02

I dig in

Rents checked against comps, records pulled from the county, costs run on real Florida numbers. Verified by code, not guessed in a spreadsheet.

03

You get the report

A clean two-page PDF, usually within a few days, ready for your next conversation.

Why I built it

"I kept watching good buyers overpay on deals that looked great on paper. The paper was the problem. So I run the numbers the way the bank will, and get them in your hands before the closing table does."

Jonas Dannenmaier · Founder, Ferinus · South Florida
Straight answers

What people ask first.

It is. No card, no strings. It is the cleanest way I know to show the work is worth paying for. Like it, and we sort out the next one.

Neither. Ferinus is an independent analysis desk. The report is not an appraisal or a brokerage service, and I never go after your client. I make your numbers hold up, that is all.

Rents from current comparable rentals, checked by unit type. Tax, assessed value and sale history straight from the county appraiser. Costs built on real Florida figures, not a national rule of thumb.

Small multifamily and income property across Palm Beach County and South Florida. Duplexes up to small apartment buildings are the sweet spot.

We find what fits once you have seen a report. Pay per property when you need one, or a simple monthly setup if you run deals often. No long contracts.

Pick one deal. Let me prove it.

Send me something you are working right now. Read the report once and you will know why your next conversation should have it in hand.

jonas@ferinus.com
I answer within one business day. First report free.