The move most people actually want is the one that looks impossible on paper: sell the Costa Mesa or Newport Beach home you have, buy the next one, and do both in the same week so you move once and carry no double mortgage. It is done all the time. It is also where I see the most stress, because two escrows means two lenders, two escrow officers, two sets of contingencies, and one calendar. This is how the tightrope is built, step by step. It is general education, not legal advice, and your lender and escrow officer should be part of the plan from day one.
In this guide: The shape of a concurrent close · The contract terms that make it work · Where the money comes from on closing day · The rent-back safety valve · Why downsizers care most · Questions I get
The shape of a concurrent close
In a concurrent close, the sale of your current home and the purchase of your next one are two separate escrows scheduled to fund and record on the same day, or within a day of each other, with the proceeds from the sale flowing into the purchase. Escrow A closes in the morning, the net proceeds wire to Escrow B, and Escrow B records that afternoon or the next morning. When both files are with the same escrow company, the officer can move funds internally, which is why I try to keep both escrows under one roof when the other side agrees.
The contract terms that make it work
On the purchase side, the key term is a contingency for the sale of your current home, which lets you cancel without losing your deposit if your sale falls through. In a cooler market, sellers accept these more readily than they did two years ago, especially when your home is already in escrow rather than merely listed. On the sale side, you want your buyer's contingencies to expire before your purchase contingency does, so you are not committed to buying while your own buyer can still walk. You also want a close date on your sale that lands at or before the close on your purchase, with a short cushion. Matching those dates, and moving them together if one side slips, is most of the job.
Planning both sides at once starts with knowing what your current home nets. The seller net sheet gives you the number your purchase will be built on.
Where the money comes from on closing day
Closing day is a sequence of wires, and the sequence has to be right. Your buyer's lender funds your sale. Escrow pays off your existing mortgage and wires your net proceeds to the purchase escrow. Your new lender, if any, funds the balance. The purchase records. If any wire arrives late, everything after it waits a day. Three things reduce that risk: have your new lender's loan fully approved and its documents signed several days before the close, ask both escrow officers to confirm wire timing with each other in writing, and have a cushion of your own funds, or a short-term bridge arrangement, in case the proceeds land a day late. I covered bridge loans and HELOCs as gap tools in buying before you sell.
The rent-back safety valve
When the dates cannot be made to match, a seller rent-back is the tool. You close your sale on schedule, and your buyer agrees in writing to let you stay in the home for a set period, often a few days to a few weeks, at an agreed daily rate, while your purchase catches up. It is documented on a seller-in-possession form and needs to be short enough to satisfy your buyer's lender, which usually means under 60 days. Buyers in coastal OC are generally willing when it is asked for up front and priced fairly, and it removes the single most stressful scenario in a concurrent close, which is having nowhere to sleep between two escrows.
Why downsizers care most
For homeowners 55 and older, the concurrent close does one more job. It puts the sale and the purchase on the same date, which means the two-year window for carrying your property-tax base is not even a question, and the new home costs the same or less relative to the sale for the 100% allowance test. A concurrent close is, in tax terms, the simplest possible Prop 19 move. The full rules, including what happens when the dates spread out, are in my guide to Prop 19 downsizing in Newport Beach, and the buy-first versus sell-first question has its own post.
Questions I get about closing both the same week
Can you sell a house and buy another on the same day in California?
Yes. A concurrent close uses two separate escrows scheduled to fund and record the same day or within a day, with the sale proceeds wired into the purchase. It works best when both escrows are with the same company and the new loan is fully approved before closing week.
What is a sale contingency when buying a home?
A contract term that makes your purchase contingent on the sale of your current home, so you can cancel and recover your deposit if your sale falls through. Sellers accept it more readily when your home is already in escrow.
What is a seller rent-back and how long can it last?
An agreement that lets the seller stay in the home after closing for a set period at an agreed rate. It is documented in writing with the sale, and lenders typically require it to be under 60 days.
Does a concurrent close help with Prop 19?
Yes. Closing the sale and purchase together keeps the transaction well inside Prop 19's two-year window and uses the 100% allowance for the value comparison, which is the simplest way to carry a property-tax base for homeowners 55 and older.
A note from Jade
A concurrent close is a project plan more than a transaction, and it goes smoothly when one person is holding both calendars. If you are trying to move once, from one coastal OC home to the next, I am glad to map the whole sequence with your lender and escrow officer before either home goes under contract.
Sources and further reading: California Association of Realtors standard forms · BOE Proposition 19 · Should you sell first or buy first in coastal OC. Reviewed September 2026.
This is general real estate education, not legal advice. Contract terms, lender requirements, and escrow procedures vary by transaction. Before making a decision, confirm the details with your lender, escrow officer, an attorney, or another qualified advisor.
