This is an estimate for planning. It is not a quote, an appraisal, a loan offer, or tax or legal advice, and Rudy is a real estate agent, not a lender, attorney or tax professional.
The four paths in plain English
Sell first
Sell your island home first and buy with the proceeds in hand. A rent-back can let you stay for a few weeks; a rental covers a longer gap.
When owners often choose it: Owners who want a firm budget or need this sale for the next down payment.
Tradeoffs: Coronado rent for the gap and maybe two moves across the island.
Same-day closings
After your buyer removes contingencies, make a non-contingent offer on the next island home and close both on the same day.
When owners often choose it: Owners who want to move once, with a buyer who can close later.
Tradeoffs: Your buyer’s escrow runs long, and the two closings move together.
Contingent offer
Your island purchase hinges on your sale, written on C.A.R.’s COP addendum, and the two escrows close together.
When owners often choose it: Owners who spot their next island home before listing, with a seller who will wait.
Tradeoffs: Sellers with other offers may decline. Contingency length and continued marketing are negotiated.
Buy first with equity
Tap the equity in your island home, through a credit line opened ahead of the listing or a bridge loan, to make the down payment; buy, move, then sell.
When owners often choose it: Owners with large equity who want a single move and time to prepare the house.
Tradeoffs: Double payments at island prices, the cost of a sizable equity loan, and a lender who signs off with both homes in your name.
Rent-backs: put it in writing
A rent-back is part of the sale contract on Coronado, as it is anywhere in California. A short stay, 29 days or fewer, usually goes on C.A.R.’s SIP addendum; once it reaches 30 days, the RLAS lease and landlord-tenant law apply (San Diego Association of REALTORS®). Your buyer needs to agree.
Contingent offers
On the island, as elsewhere in California, a purchase that hinges on a sale is written on C.A.R.’s COP addendum (revised June 2024). It fixes the selling deadline, says whether the seller may go on marketing, and explains what a backup offer would set in motion. Rudy fills it in with you.
Questions to ask your lender
- Do both mortgages count when I apply while still owning this home? Per Fannie Mae’s guide they do, unless a buyer has signed and removed the financing contingency.
- If my next island loan is a jumbo, how do you price and approve it?
- Would a line of credit on this home, opened before listing, cover my down payment?
- What does a rate lock extension cost if either closing moves?
Owners 55 and older: Proposition 19 timing
Staying on the island in a smaller home? Proposition 19 may let you take your tax base with you if you’re at least 55, severely disabled or a wildfire or disaster victim, and the replacement is bought or built no more than 2 years before or after the sale. Its value can reach 100% of the original’s when it comes first, 105% when bought in the first year after the sale and 110% if bought in year two.
Buying first means paying full-value tax until the sale, since the Board of Equalization starts the transfer on the later transaction, and there’s no refund. Eligibility is up to the county assessor, and a tax adviser can review the timing with you.
Jumbo loans: San Diego County’s one-unit conforming limit for 2026 is $1,104,000 (FHFA), and larger loans are jumbo loans with separate pricing, so the rate here is a starting point.
Moving to a smaller island home? Try the downsizing calculator for the tax math.
About these numbers
- Island math in calendar days; a weekend closing date gets a flag, not a shift.
- Both homes closed, each path lands on the same equity; the cash you front and the extra costs are the difference.
- Rent, double payments and equity-loan interest accrue daily here.
- Gains tax is outside this model, so ask your CPA; the lender owns rates and approval.
Questions owners ask
Can I buy my next island home before I sell this one?
It’s possible when savings or an equity loan can fund the down payment and a lender qualifies you with both payments. The buy-first column shows the numbers.
Will my next Coronado loan be a jumbo?
If it’s over $1,104,000 in 2026, yes. Ask a lender who makes jumbo loans for a quote early.
Can I keep my property tax base if I downsize on the island?
Possibly, under Proposition 19 if you’re 55 or older and the purchase falls within 2 years of the sale. The assessor decides.
How long can I stay after selling?
Short stays of up to 29 days usually go on an SIP addendum, while longer ones need the RLAS lease. Either way the buyer decides whether to allow it.
Sources: Zillow Research home values, rents and days to pending (Sep 2026); Zillow metro days to pending, weekly (week ending Oct 24, 2026); Freddie Mac Primary Mortgage Market Survey (Oct 29, 2026); FRED bank prime loan rate (Oct 27, 2026); NAR 2025 Profile of Home Buyers and Sellers (summary) (Dec 8, 2025); Freddie Mac: budgeting for upfront homebuying costs (Jun 4, 2025); California Civil Code 1675; CFPB: private mortgage insurance (Aug 28, 2023); CFPB: home equity lines of credit (Aug 28, 2026); Fannie Mae Selling Guide B3-6-06 (Sep 2, 2026); C.A.R. list of standard forms (Oct 30, 2026); San Diego Association of REALTORS®: post-closing occupancy (Aug 27, 2025); FHFA 2026 conforming loan limits; California State Board of Equalization: Proposition 19 (Oct 30, 2026). Your contracts, your lender and the county assessor have the final word on your own dates, loan and taxes.
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