The full picture of every home you own
Every HOA notice, tax bill, utility warning, deadline, and document, organized by property. Property management runs the tenant side. Mainstay runs the ownership side.
Setting up your portfolio is easy
Upload or paste in a list of your addresses. Add any documents you have, leases, CC&Rs, tax bills, or an entire folder at once.
You get a custom email and mailing address for your properties. We take it from there.
Every home gets a complete record
Every letter, lease, statement, and rulebook, filed to the right home. The record keeps building as new mail arrives.
Missing a lease or last year's tax bill? We show you that too.
One list of everything that needs you
Mainstay reads everything and separates routine records from what needs action.
A tax bill becomes a payment task. An HOA notice becomes a deadline. A utility warning surfaces before service is interrupted.
Come back from a week away and see exactly what moved.
Ask anything about your homes
What do I owe across my HOAs this month? Is a shed allowed? When does the lease at 88 Harper Ln renew?
Ask in plain English. The answer comes from your own records, source page attached.
Optimize your portfolio
Mainstay saves you money on every home you own.
Never miss a bill or deadline
Every bill lands on your list the day it arrives, with the amount and due date pulled out.
No more late fees, liens, or penalties and interest. No preventable service interruptions.
We appeal your property taxes for you
Every assessment is reviewed. Looks too high? We tell you the odds an appeal wins and what you would save.
Say the word. We file the appeal, manage the process, and come back with the result.
Know the fair rent for every home
See fair market rent for every home you lease, backed by comparable rentals.
Every renewal priced with data, not guesswork.
It adds up
Every late fee avoided. Every appeal won. Every rent set right.
See the value per home and across everything you own. That is the full picture.
Common questions
What is Mainstay for owners?
Mainstay runs the ownership side of your rentals. It reads everything your properties send. Every home gets a record, every deadline gets tracked, and the numbers get watched, from property taxes to fair market rent. You invested in homes, not homework.
How is this different from property management software?
Property management tools run the tenant side. Rent collection, maintenance, leasing. Mainstay runs the owner side. HOA notices, tax bills, insurance, utilities, and the record of it all. Many owners use both.
How do I keep track of HOA notices across multiple rental properties?
Most owners forward mail, chase PDFs across inboxes, and keep spreadsheets of dues. Mainstay replaces that with one inbox for every property. Everything lands in one place, triaged, with action items on top.
What happens if I miss an HOA deadline or violation notice?
Missed HOA deadlines compound quickly. A violation becomes a fine. Fines accrue late fees. In many states, associations can lien the property. Mainstay surfaces every deadline in one view so nothing slips.
Does Mainstay work with any HOA?
Yes. Mainstay works with mail and email from any association. No HOA participation required. It already tracks obligations across tens of thousands of properties.
What ends up in my property's record?
Everything that arrives and everything you add. HOA letters, CC&Rs, leases, tax bills, insurance, utility statements. Drop in a whole folder and each file lands on the right property. Missing something important? The record shows that too. Share it with anyone who works on your properties.
What can I ask Mainstay?
Anything your documents can answer. Whether a shed is allowed, what you owe across your HOAs this month, when a lease renews, what a fee covers. Every answer shows the document and page it came from.
Can Mainstay answer questions about my CC&Rs and governing documents?
Yes. Ask whether something is allowed, what a fee covers, or what a rule means. You get a plain answer backed by the exact page it came from. No more reading 80-page PDFs.
How does Mainstay save me money on property taxes?
Every assessment gets read and checked. Looks too high? Mainstay tells you the odds an appeal would win and what you would save. Say the word. We file the appeal, track it, and come back with the result.
How does the rent guidance work?
Mainstay shows fair market rent for each home you lease. Renewals get priced with data, not guesswork. It is guidance for your decision, not automatic pricing.
How does Mainstay receive my communications?
You get a Mainstay email address the moment you sign up. Add it to your HOA portals and other senders. Everything flows through Mainstay from day one, read and triaged. Setup takes minutes.
How do I onboard a large portfolio?
Paste in your address list or upload the file you already keep. Every property gets matched at once. Add any documents, leases, CC&Rs, agreements, and each gets filed to the right home. Hundreds of properties, one sitting.
What about physical mail?
If a sender only mails paper, we give that property a custom mailing address. Letters arrive there, get scanned, and land on the same list as everything else. You can always open the original scan.
Do I need to change my mailing address with every HOA?
No. Most owners start with email alone, a quick update in each HOA portal. Physical mail is optional. If you want it, we provide the address and handle everything that arrives. Your HOAs never need to adopt anything new.
Who is early access for?
Rental property owners and property managers of any size. Mainstay already handles HOA obligations for some of the largest single-family portfolios in the country. The same engine is now open to everyone.
How much does Mainstay cost?
Early access members get pricing first, before public launch. Joining the list is free and there is no commitment.
That is the whole thing
Mainstay reads what your properties send and tells you what matters. It already does this across tens of thousands of homes. Join the waitlist to be first in. You invested in homes, not homework.