Residential · Commercial · Industrial · Multifamily

The transaction isn't the business. The margin is.

Eight years. 80+ luxury flips. Two businesses built and sold. I find, underwrite, and build deals in metro Phoenix. I've put substantial capital of my own at risk to build this record and continue to — now I'm raising to scale it.

80+ completed flips — the numbers are published on this site, verifiable in public records
General contracting in-house — cost and schedule are mine to control
Two operating businesses built and sold at substantial returns

See a completed deal

Invest With Me

Request the next deal memo

When a project survives my filter, I write a memo with the full numbers — basis, budget, downside case, projected exit. People on this list read it before the deal is funded.

I do a small number of deals a year. This is an interest list, not an offering — submitting it doesn't commit you to anything and doesn't reserve anything. It tells me who to talk to when a project comes together, at which point any investment would be presented separately through formal documents prepared with counsel.

Track record

A recent project, in numbers.

The 11 projects published here: $13.28M deployed · $16.56M gross exit · $3.28M gross spread · 25% gross return on basis · 6.3 mo average hold

Before

After

Windrose Drive

Scottsdale Mountain, Scottsdale · 4,474 SF · Jan 2025 → Oct 2025

Purchase price$1,600,000

Renovation cost$500,000

Total time to exit9 months

Sale price$2,612,000

Gross spread$512,000 · 24.4% on basis

Spread is gross — before commissions, closing costs, and holding costs. Every completed project on the residential page is published the same way: purchase, renovation, exit.

See all completed projects

More completed projects

Canyon View Road

DC Ranch, Scottsdale

Refi $1.75M · 7 mo · 35.7% gross

Canterbury

Moon Valley, Phoenix

Sold $970K · 9 mo · 34.7% gross

Highlands Drive

Paradise Valley

Sold $3.10M · 4 mo · 26.4% gross

Sahuaro Drive

Phoenix

Sold $775K · 4 mo · 26.0% gross

86th Street

Scottsdale

Sold $1.15M · 7 mo · 25.7% gross

109th Street

McDowell Mtn Ranch, Scottsdale

Sold $1.90M · 4 mo · 24.5% gross

Lincoln Drive

Phoenix

Sold $1.30M · 7 mo · 20.9% gross

Sheridan Street

Scottsdale

Sold $815K · 5 mo · 20.7% gross

Catalina Drive

Phoenix

Sold $870K · 6 mo · 19.2% gross

Dixileta Drive

Scottsdale

Sold $1.32M · 7 mo · 11.9% gross

Alignment

This record was built with my own capital at risk.

Eight years and more than eighty projects were funded with significant capital of my own on the line, and I continue to invest in this work. Capital structure varies deal to deal — on some, investors fund the full equity. What doesn't vary is the standard: I don't earn by raising money, I earn when a project exits well. A deal I wouldn't be willing to back myself doesn't reach your inbox. I'd rather do a small number of larger, better deals with people I know than a large number of thinner ones — and what I need to do more of them is capital.

Background

Licensed at 19. First flip at 20. A $6M portfolio buyout at 23.

I started on luxury listings in Scottsdale at 19, learning how high-end property is priced and who buys it. I bought my first flip at 20 and scaled hard — then partnered into a portfolio of nearly 30 single-family and small multifamily units across metro Phoenix.

When COVID reshaped the market I bought my partner out of roughly $6 million of real estate at 23, stabilized it, and sold it. Alongside the flipping I built and sold two operating companies — a cabinet and flooring business grown to ten employees, and a dental practice. Both exited at substantial returns.

The sequence has been deliberate: each venture funded and informed the next. Today the focus is luxury residential in Scottsdale and building the general contracting business into a platform — the foundation for acquiring established trade companies and, over time, cash-flowing commercial assets across the Valley.

Colby McMahon at a completed project — Colby McMahon — on site, Scottsdale

Capability

Margin is built before the market has any say.

Discretion & underwriting

I refuse most of what I look at, and for specific reasons. I underwrite to a conservative exit, price the renovation line by line, and never underwrite appreciation. If a deal only works because the market goes up, it's a bet — not a deal.

Construction in-house

My own general contracting crews build every project — cosmetic remodels through structural renovations and warehouse demising. Cost and schedule are things I control, not things I'm quoted.

Diligence before closing

Before I close I've walked the property, pulled permits, confirmed zoning and utility capacity, and priced the work myself. The surprises that destroy a return are things somebody could have found and didn't.

Returns

The margin gets built in three places.

The basis

Most of the return is decided the day I buy. A property acquired below what its best use supports is profitable on paper before a single trade shows up.

The build

I build the work myself. Crews on my projects year-round earn pricing and scheduling a one-off owner can't get — plus wholesale access on cabinetry and flooring.

The clock

Interest, taxes, and insurance accrue against a fixed exit price. Finishing months ahead of the normal pace converts directly into return.

"Investing with Colby has yielded me a much higher return than the S&P while also feeling in more control. Can’t wait for the next project."

Kyle Kinzle — Investor

Invest alongside me.

For eight years the constraint on this business has been capital, not opportunity — I still pass on deals I want every year for no reason other than what I can fund. Partnering with investors is how I take this to the next level. If you've been interested in real estate, tell me what you're looking for and on what timeline. When a project survives the filter, the people on this list read the memo first.

Request the Deal Memo

Prefer to just talk? Email colby@colbil.com — it goes straight to me.