First Door Investing News 9-18-26

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, September 18, 2026. Today's lesson breaks down the internal rate of return, the number that folds timing into a deal's overall return. Also inside: apartment construction starts plunging in August, pending home sales sinking to a near three-year low, foreclosures rising fastest in Florida, Texas, and California, and seven ways to invest as America ages.

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: Real estate always goes up. The reality is that values can and do fall, as rising rates, overbuilding, and this year's climbing foreclosures all show. A sound investment earns its keep through the income it produces today, not a promise that prices will only ever rise.

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

Internal rate of return, or IRR, is a single percentage that tries to capture a deal's full return over time, blending the cash you receive each year with the profit at sale, and accounting for when each dollar arrives. The timing part is what sets it apart. A dollar returned next year is worth more than one returned in year five, and IRR bakes that idea in, which is why sponsors lean on it to summarize a multiyear investment in one number.

Here is why it matters to you. IRR lets you compare deals that pay out on very different schedules, since it rewards money that comes back sooner and counts money that takes years to arrive as worth less. Two investments can advertise the same total profit, yet the one that returns your capital faster will show a higher IRR. Knowing that helps you read past a big headline number and ask when, exactly, the return is expected to show up.

The honest caveat is that IRR is only as good as the assumptions behind it, and much of a projected IRR often depends on selling the property for a healthy price years from now. Change the sale assumption and the number can swing widely, which is why a high projected IRR is a forecast, not a promise. Treat it as one useful lens, and always ask how much of it rests on cash flow today versus a profitable exit tomorrow.

Read more at Investopedia

The number of new apartments breaking ground fell almost 16 percent in August, and the pace of new units being completed dropped sharply from a year earlier, according to HUD and Census Bureau data reported by Multifamily Dive. When builders start fewer apartments, less new supply arrives down the road, which tends to keep existing rentals fuller and rents steadier. For a new investor, it is a reminder that today's construction pullback can quietly strengthen demand for the apartments already standing.

Read the full story at Multifamily Dive

Redfin reports that the number of homes going under contract has fallen to its lowest point in almost three years, as high mortgage rates keep many buyers on the sidelines, per Redfin. The buyers who remain now face less competition and more room to negotiate on price, repairs, and closing help. For a new investor, it is a reminder that a slower market can create better entry points, and that patience often buys more leverage than urgency.

Read the full story at Redfin

Foreclosure activity kept climbing in August, with 25,894 foreclosure starts nationwide and Florida, Texas, and California leading the pack, per Realtor.com. A foreclosure start is the first formal step a lender takes when a borrower falls behind, so a rising count signals more households under strain. For a new investor, it is a reminder that even a broadly stable market carries pockets of stress, and that watching where distress is building is part of reading a market honestly.

Read the full story at Realtor.com

With a record wave of Americans turning 65 over the next few years, BiggerPockets outlines seven real estate strategies aimed at an aging population, from senior-friendly rentals to housing near medical hubs, per BiggerPockets. Demographic shifts move slowly but powerfully, steering where housing demand grows over the long run. For a new investor, it is a reminder that big, predictable trends like an aging population can matter as much to a market's future as this month's interest rate.

Read the full story at BiggerPockets

"How much of this deal's projected return depends on selling for more later, and what has to happen in the market for that to come true?"

A return that leans heavily on a higher future sale price is really a bet on the market, not just on the building. A sponsor who can separate the income a property earns today from the profit they hope to capture at sale is being honest about where the risk really sits.

A note from Fourth Wall Capital

Today's lesson on internal rate of return connects to a discipline we hold closely at Fourth Wall Capital. A return that depends mostly on selling for a higher price years from now asks an investor to trust the market, so we weigh the income a property earns today at least as heavily as any projected exit.

That same discipline shapes how we read a week of climbing foreclosures and a cooler housing market. We do not assume rising prices will rescue a deal, so we stress-test every purchase against the rent it collects now, so your capital rests on a foundation we can defend today rather than a recovery a headline predicts.

Learn more at fourthwall.capital

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