Edit: He Grew Up in a Rental. Now He Owns 340 of Them.

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Marcus Webb will be specific about the first number: $25,000. That's what he had when he bought his first property, a three-bedroom row house in Baltimore's Berea neighborhood, in 2019. The roof leaked. The water heater was original to 1987. The previous tenant had punched a hole in the kitchen drywall that no one had patched.

He fixed all of it. Then he rented it for $1,150 a month.

"I cleared about $4,200 in the first year after expenses," he says. "That sounds small. But I grew up in a house just like that one, and watching that money come in every month — that felt like something."

Seven years later, Keystone Housing Group manages 340 units across Baltimore, Richmond, and Pittsburgh. Last year, the company generated $4.2 million in revenue. Marcus employs 19 people and is in the process of closing on 48 more units across two new markets.

He is 38 years old.

## A Front-Row Seat to How It Worked

Marcus grew up in rental housing in East Baltimore, the second of three children raised by a single mother who worked as a medical biller. His childhood was stable enough — they moved twice but never lost housing — and he spent years watching the quiet machinery of rental income without understanding what it was.

"Every first of the month, Mr. Dorsey would pull up in a Cadillac," he says. "We lived in a rowhome he owned. He'd collect rent from six families on our block and drive away. I thought: that man doesn't do anything. He just shows up."

He didn't romanticize it. He filed it away.

Marcus studied finance at Morgan State University on a partial scholarship and graduated in 2009, directly into the worst job market in decades. He spent five years in bank operations at M&T Bank, learning underwriting standards and loan structures from the inside. He wasn't investing. He was watching.

"I saw how the math worked," he says. "How debt gets structured, how appraisals work, how you manufacture equity. The people getting wealthy weren't smarter than the people I grew up with. They just had access to the mechanics."

> "The neighborhoods I grew up in aren't underserved. They're underinvested. That's a solvable problem."

## The First House

In 2017, Marcus started attending a real estate investors' meetup in Baltimore. He was one of the few Black people in the room, a fact he noted and moved past.

"I wasn't there to make a political statement," he says. "I was there to learn the playbook."

He learned. In 2019, with $25,000 saved over two years, he bought the Berea row house for $48,000 — financed with a hard money loan — rehabbed it for $19,000, and refinanced at the new appraised value of $97,000, pulling nearly all his cash back out. He repeated the process four more times over the next 18 months.

By 2021, he owned six properties, was cash-flowing $6,400 a month net, and had a management problem.

"I was doing everything by text message," he says. "Maintenance requests, rent reminders, lease renewals. I lost a good tenant because I missed a lease renewal text. I said: this doesn't scale."

## Building the System

Marcus built a basic property management workflow using Notion and Zapier. Then he hired a developer to turn it into something real — a simple web app that centralized every tenant communication, maintenance ticket, lease document, and payment record. He named it KeyOS.

It wasn't intended to be a product. It was a fix for his own chaos.

But when he mentioned it at a local investors' meetup in early 2022, three landlords immediately asked if they could use it.

"I didn't know what to say," he says. "I said, sure, give me a month."

He didn't launch a SaaS company. He made a decision he considers pivotal: he kept KeyOS internal and used it as the foundation for a property management service. Instead of selling software, Keystone would manage properties on behalf of other landlords — handling everything through KeyOS, charging 8% of collected rent.

"I've watched software companies spend three years and $2 million chasing product-market fit," he says. "I charge 8%, I manage your property, I get paid when you get paid. That's a business I understand."

## The Expansion Problem

By early 2023, Keystone was managing 90 units for 12 outside landlords in addition to Marcus's own portfolio. Then came the call that tested everything.

A Baltimore-based real estate fund needed a management partner for 60 units they'd acquired in Richmond, Virginia — a city where Keystone had no presence, no contractor relationships, no brand.

Marcus said yes.

"I probably shouldn't have," he admits. "We had four employees at the time. We spent six weeks building a vendor network in Richmond from scratch. We got it done, but it was close."

The Richmond contract was worth $420,000 in management fees annually. It also gave Keystone a template for entering new markets: spend six weeks building the vendor infrastructure before taking on a single unit. They used the same playbook in Pittsburgh in 2024.

## Where Things Stand

Keystone Housing Group closed 2025 with 340 units under management, $4.2 million in total revenue across management fees and Marcus's personal portfolio, and a staff of 19. Marcus owns 78 units outright. The other 262 are managed for outside investors.

His focus now is the middle of the market — workforce housing for people who earn too much for subsidized housing but too little for new construction. It is, he says, one of the most underserved segments in American real estate.

"The neighborhoods I grew up in aren't underserved," he says. "They're underinvested. That's a solvable problem. You just need someone willing to work in them."

He pauses.

"And someone who grew up in them. That helps."

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