First Door Investing News 10-23-26

First Door Investing News is published daily by Fourth Wall Capital, a multifamily real estate investment firm based in Maryland. Learn more at fourthwall.capital

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Good afternoon. It's Friday, October 23, 2026. Today's lesson breaks down IRR, the internal rate of return, the single number that tries to capture both how much a deal pays and how quickly you get it back. Also inside: why pending home sales just sank to a new low, why more buyers are turning to adjustable rate mortgages, what real landlords actually earn on their rentals, and why America's aging homes are quietly keeping the market tight.

Real estate investing doesn't have to be complicated. Every day we bring you one market update, one practical lesson, and a few stories that help you understand what's happening in the housing world, in plain language, without the jargon. Let's get into it.

Myth: The projected IRR you see in a deal is what you will actually earn. The reality is that IRR is only a forecast built on assumptions about rent growth, the eventual sale price, and timing, so the real return can land higher or lower. Treat a projected IRR as a careful estimate to question, not a promise to bank on.

Every First Door edition includes one foundational concept explained clearly. Today: internal rate of return.

Internal rate of return, almost always shortened to IRR, is a single percentage that tries to capture a deal's total performance over its whole life, both the cash it pays you along the way and the profit when the property sells. What sets it apart from a simple return is that it accounts for timing, treating a dollar received soon as worth more than a dollar received years later. In plain terms, IRR rewards getting your money back faster, which is why two deals that return the same total dollars can show very different IRRs.

Here is why it matters to you. Sponsors lean on IRR because it folds cash flow, appreciation, and timing into one figure you can compare across very different deals. For a passive investor, it is a useful shorthand for how hard your capital is expected to work over the full hold, and it helps you weigh a deal that pays steadily against one that saves most of its profit for a sale.

The honest caveat is that IRR is only as trustworthy as the assumptions behind it, and it leans heavily on a future sale price no one can guarantee. A high IRR can be manufactured by assuming an optimistic exit or a quick refinance, so the number can flatter a deal that still carries real risk. Ask what rent growth and sale price drive the projection, and how it holds up if those come in lower.

Read more at Investopedia

Redfin reports that U.S. pending home sales fell to a new low in the four weeks ending October 18, as would be buyers kept pulling back with mortgage rates stuck in the mid 7 percent range, per Redfin. When buyers cannot make the monthly math work, many stay in rentals rather than purchase, which steadies the demand beneath apartments. For a new investor, it is a clear sign that today's affordability squeeze keeps the rental pool full even as the for sale market stalls.

Read the full story at Redfin

Keeping Current Matters reports that more buyers are choosing adjustable rate mortgages, loans whose interest rate starts lower but can change later, as a way to trim the monthly payment while rates sit high, per Keeping Current Matters. The move can make a purchase reachable today, though it trades away the certainty of a fixed payment down the road. For a new investor, it is a window into how stretched affordability has become, and a reminder that the same pressure keeps many households renting.

Read the full story at Keeping Current Matters

BiggerPockets walks through the real income of four actual rental properties, showing what owners collect after expenses rather than the tidy figures in a sales pitch, per BiggerPockets. The honest takeaway is that returns vary widely by property and market, and that steady, modest cash flow is far more common than an overnight windfall. For a new investor, it is a grounding look at what rentals really pay, useful context before you weigh any deal's projected return.

Read the full story at BiggerPockets

Realtor.com reports that much of the U.S. housing stock is aging and in need of repair, yet homeowners are increasingly steering their equity toward other uses rather than updates, per Realtor.com. An older, under maintained supply of homes is one more reason the market stays tight, since fewer move in ready places reach buyers and renters. For a new investor, it is a reminder that the housing shortage is about the condition of homes, not only their number.

Read the full story at Realtor.com

"What assumptions about rent growth and the final sale price drive this deal's projected IRR?"

IRR leans heavily on a future sale that no one can promise, so the assumptions behind it decide whether the number is realistic or wishful. A sponsor who can show how the projection holds up if rents or the exit price come in lower is being honest about the risk you are taking.

A note from Fourth Wall Capital

Today's lesson on IRR reflects a caution we hold at Fourth Wall Capital, that a single return number is only as sound as the assumptions underneath it. We treat a projected IRR as a set of claims to stress test, not a promise, because a figure that depends on a perfectly timed sale is really a bet on the market rather than on the building.

That same discipline shapes how we read a market where buyers keep pulling back and more of them are stretching just to afford a monthly payment. We would rather underwrite to the rent a property earns today, in places where people can genuinely afford to live, so your capital rests on numbers we can measure now rather than a future no one controls.

Learn more at fourthwall.capital

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