PropertyManagement
Your property, cared for like ours.
We own small multifamilies right here on the South Shore, and yours gets the same care — the house you moved out of or the building you've had for years. You keep the home, the rate, and your evenings.
Why 421 Property Management
Fast answers. Real people. Prices on the page. Nothing forgotten.
Some of our owners never planned on being landlords. Others run multifamilies and are done doing it all. Either way, we take the part you don't want — with the playbook we use on our own buildings.
01
You'll hear back today
Call, text, or email — one of us three answers, today. Tenants get the same, so small problems stay small.
02
We show up in person
We know our owners by name and our properties by sight. News comes from someone who's actually been there.
03
Prices you can read right here
One flat 8%, published on this page. If a cost isn't listed, we don't charge it.
04
A back office that doesn't forget
421 AI Labs keeps your books current, your deadlines tracked, your monthly report written. We run it — you get the results.
Inside 421 AI Labs
An agentic specialist team, dedicated to your building
A bookkeeper, a tenant-relations desk, a compliance officer, a vendor coordinator — all run by us, on our end. Nothing to learn, no portal to log into. Everything they do rolls up into one report, every month:
Your monthly report
12 Maple St · October
Rent collected
$0
✓ Unit 1 — paid Oct 1$1,650
✓ Unit 2 — paid Oct 1$1,500
✓ Unit 3 — paid Oct 3$1,500
Your money
Rent collected+$4,650
Oct 4 · Faucet repair, unit 2 — plumber−$185
Oct 8 · Gutter clog, unit 3 — in-house−$45
Oct 12 · Smoke & CO batteries, all units — in-house−$18
Oct 14 · Lawn mowing−$50
Management fee (8%)−$372
To you$0
Year to date
Rent collected$0
Taxable income, after expenses & fees$0
Figures current through October 18 — nothing to reconstruct in April.
This month
Leaky faucet, unit 2 fixed — plumber, $185 invoice attached
Gutter clog, unit 3 fixed — done in-house, $45
No-heat call, unit 1 scheduled — plumber Thursday
Lawn mowed Tuesday — $50, on your statement
Coming up
Section 8 inspection window opens Nov 3 — unit prepped, nothing needed from you
Unit 2 lease renews Jan 1 — notice goes out Nov 1, renewals always free
Written in plain English every month. Reply, and a person answers.
Tenant communications, handled promptly
Tenants reach us, not you. Every request logged, answered, followed through — every thread visible to you.
Bookkeeping with real tax visibility
Every dollar categorized as it happens, your tax picture current all year. You'll know what you owe before your accountant asks.
Compliance calendar, tracked for you
Deposit deadlines, Section 8 windows, renewal notices — the little dates that turn into big penalties. We act before they're due.
Maintenance, coordinated end to end
We fix most things in-house at handyman rates — licensed pros only when the job truly needs one. You approve anything significant; we check the work and book the invoice.
Two ways to work with us
Full property management, or just the agentic tools
Full Property Management
We run everything — tenants, vendors, the day-to-day.
8%of collected rent
- Management fee8%
- 421 AI LabsIncludedour specialist engine — most managers don't have one
- Leasing fee50%of one month's rent when we place a new tenant — renewals are always free
- Lawn care & snow removalFlat rateone number, agreed up front — or bring your own contractors
- Maintenance & handyman workQuoted per jobmost fixes in-house at handyman rates — licensed pros only when needed
What a month actually costs
On a $1,500 unit, 8% is $120. Lawn and snow: one flat rate, agreed up front — or keep your own contractor. No surprises.
Best for
Owners who want their evenings back.
421 AI Labs — agentic tools only
You keep the day-to-day — we power your back office.
Your own specialist back office
- Build and scale — take on more doors without hiring
- The same agentic engine behind our managed doors
- Bookkeeping, compliance, tenant comms, owner reports
- Runs on our hardware — nothing to host or babysit
- Built around your workflow, not a portal
Pricing
Scoped per project, priced before we start — plus a monthly retainer that keeps it tuned as you grow.
Best for
Hands-on operators who want the engine.
Meet the team
Three partners. You'll know all of us by name.
Colby
Maintenance & 421 AI Labs
Colby runs maintenance across our buildings and builds 421 AI Labs — the tools behind our bookkeeping, reporting, and compliance tracking. It's how three people deliver a full back office.
Nick
Clients & tenant relations
Nick is the person owners and tenants actually talk to. He handles tenant communications and your reports, and he's on site most days — which is why small problems at our properties get caught while they're still small.
Steph
Strategy & operations
Steph is the team's strategist and manager. She decides what we take on and how we run it, keeps the operation honest about where it can do better, and makes sure the details that matter to owners never slip.
Client review
“Moving across the country is stressful, but partnering with Four Twenty-One completely solved our property management worries. They handled everything to get our home rental-ready, navigated town laws, and managed the entire tenant screening process to find us great renters. Having a team this reliable, skilled, and trustworthy managing our home from afar gives us total peace of mind. I cannot recommend them highly enough.”
Where we work
Serving the South Shore
Serving Taunton, Brockton, Attleboro, Norton, Raynham, Bridgewater, Easton, Stoughton, Middleborough, Lakeville, North Attleboro, Mansfield, Plainville and nearby South Shore towns.
Slide the map to explore →
Just outside the shaded counties? Ask anyway — close counts.
Get started
Tell us about your property
Send us a note and we'll talk it through — no pressure, no pitch deck.