This home is in Treaty Oaks, St. Augustine — a home near Pedro Menendez High School.
Sold·Closed Jun 26, 2026·13 days on market·Recent sales in Treaty Oaks·Treaty Oaks
189 Onyx Court
St. Augustine, FL 32086
5 more homes for sale in Treaty Oaks →Search Treaty Oaks on the map
About this home
Treaty Oaks
Welcome to life on one of the coolest cul-de-sacs in Treaty Oaks -- where neighbors gather, block parties happen, and community feels effortless. Tucked away on a quiet street and backing directly to a peaceful preserve, this home offers a rare combination of privacy, space, and connection in the only St. Augustine community that offers a private entrance directly into all the incredible amenities of Treaty Park. Built in 2019, this thoughtfully designed 5-bedroom + office/flex room, 3.5-bath home offers a layout that truly works for the way people live today. The main level is both functional and inviting, featuring a versatile flex room at the front of the home - currently offered as an office but is also a conforming sixth bedroom or guest space if needed. A separate formal dining room provides the perfect setting for hosting holidays and special gatherings, while still maintaining a sense of privacy from the main living areas.
Next steps in Treaty Oaks
Cost to own
True monthly cost
What this home actually costs per month at the asking price — not just the mortgage.
- • Homeowners insurance is on top — in Florida it varies widely with roof age and wind/flood zone (see the Reality Check below). Budget it before you offer.
- • In CDD communities (Nocatee, eTown, Seven Pines…), bond assessments are collected on the property-tax bill, and the amount varies home to home — a prior owner may have prepaid the bond — so we confirm this home’s exact line rather than trust a community average.
- • Taxes are estimated at YOUR purchase price — Florida assessments reset on sale, so the seller’s current bill is usually lower than yours will be (that applies to the reference bill above too).
Mortgage calculator — adjust rate & down payment
Cost to own
Mortgage calculator
Storms & insurance
Florida Reality Check
The storm-and-insurance facts every Florida buyer should know up front.
Flood zone not yet determined
Check the exact parcel at msc.fema.gov or ask Krista to pull it.
Flood damage is not covered by standard homeowners insurance — it’s always a separate policy.
Evacuation zone not yet determined
Check floridadisaster.org/knowyourzone.
Roof: Shingle — year not disclosed (home built 2019)
Roof age drives Florida insurance pricing more than anything else — worth confirming before you offer.
Solar potential: ~1,785 usable sun-hours per year
A strong solar roof by Florida standards — worth pricing panels if energy bills matter to you.
Krista can connect you with local insurance quotes before you make an offer.
Ask about this homeThis Reality Check is informational only — it draws on FEMA/FDEM hazard layers, Florida DOH water records, and the listing’s own fields at this property’s coordinates. None of it is a determination, survey, or inspection, and public records can lag or conflict with on-site conditions. Independently verify anything you’ll rely on: the flood zone at msc.fema.gov and floridadisaster.org/knowyourzone (and confirm flood-insurance cost with your lender and a licensed insurance agent), and the sewer/septic, roof, and utilities with a professional inspection.
Sun & Light
East-facing backyard — the morning-light lot
The listing reports the home facing west, which puts the backyard on the east side. Today at this address: sunrise 7:25 AM, sunset 6:59 PM.
- The rear takes the sunrise and the gentle morning sun, then goes shaded through the afternoon — the classic comfortable-summer-evening lanai in Florida.
- A pool back here warms with the morning and sits in shade by late afternoon: cooler water than a west lot, and evening swims without the glare.
- The front of the home carries the hot western afternoon instead of your living space.
Orientation per the MLS listing; sun paths are seasonal geometry for Northeast Florida, not a shade study — trees, screening, and neighboring structures change the picture on any specific lot.
Cost to own
Taxes & assessment
| Year | Market value | Taxable value | Change |
|---|---|---|---|
| 2025 | $430,064 | $266,423 | — |
| 2024 | $476,502 | $258,207 | — |
| 2023 | $438,049 | $249,230 | — |
| 2022 | $369,039 | $240,515 | — |
| 2021 | $289,364 | $232,053 | — |
| 2020 | $278,159 | $228,159 | — |
2025 property taxes (current owner): $4,084/yr
Estimated taxes if purchased at asking price: ~$8,900/yr
Florida’s Save Our Homes cap limits how fast the current owner’s assessment can rise — and it resets when a home sells, so a buyer’s tax bill is typically based on the purchase price, not the seller’s bill above. Estimate uses the median effective rate across 1,595 current St. Johns listings and includes typical non-ad-valorem assessments; actual taxes depend on exemptions and taxing district. Sources: Florida DOR certified tax roll (2025), NEFMLS.
Closed sales
What sold nearby
Closed sales within about two miles in the last 18 months, same property type, similar size. Closed prices from the MLS, not estimates. Their median is $255/sq ft; this home is listed at $205/sq ft.
| Address | Closed | Price | $/sq ft | Bd/Ba | Sq ft | DOM | Miles |
|---|---|---|---|---|---|---|---|
| 535 Aventurine Avenue, St. Augustine, FL 32086Listed by MOSS REALTY | Jun 2026 | $435,000 | $201 | 4/2.5 | 2,164 | 80 | 0.1 |
| 695 Sandstone Drive, St. Augustine, FL 32086Listed by KELLER WILLIAMS REALTY ATLANTIC PARTNERS ST. AUGUSTINE | Aug 2025 | $495,000 | $203 | 4/3 | 2,440 | 103 | 0.3 |
| 115 Sierras Loop, St. Augustine, FL 32086Listed by THOMPSON REALTY & DEVELOPMENT INC. | Sep 2026 | $548,000 | $242 | 4/2.5 | 2,268 | 143 | 0.4 |
| 1191 Brookside Court, St. Augustine, FL 32086Listed by WATSON REALTY CORP | Sep 2026 | $770,000 | $267 | 4/2.5 | 2,884 | 131 | 0.8 |
| 217 S Shadowwood Drive, St. Augustine, FL 32086Listed by KELLER WILLIAMS REALTY ATLANTIC PARTNERS ST. AUGUSTINE | Jul 2026 | $700,000 | $339 | 3/2 | 2,067 | 41 | 0.9 |
| 400 Plantation Grove Lane, St. Augustine, FL 32086Listed by OPENDOOR BROKERAGE, LLC. | Jul 2026 | $850,000 | $255 | 5/3 | 3,338 | 12 | 0.9 |
Sold data from the realMLS IDX feed. A closed price is what a buyer paid, not what this home is worth; Krista runs the adjustments per home.
Features
School Information
Community Information
Amenities
Interior
Exterior
Additional Information
Listing Courtesy of: KELLER WILLIAMS REALTY ATLANTIC PARTNERS ST. AUGUSTINE
Information deemed reliable but not guaranteed. Data provided through the IDX program of realMLS (Northeast Florida Multiple Listing Service). © 2026 Northeast Florida Multiple Listing Service, Inc. All rights reserved.
The neighborhood
About Treaty Oaks
Treaty Oaks is a neighborhood in Southern St. Johns County, FL (St. Johns County), ZIP 32086.
View all Treaty Oaks homes for sale →Keep looking
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Your Local Realtor
Krista Fracke
Broker Associate
This home sold on Jun 26, 2026. If you own nearby and want to know what this sale means for your value, or you're shopping this street, I can walk you through it.
Text Krista about this saleHomes for sale nearby →20+ years · 500+ closings · NE Florida
Curious what nearby homes sold for?
MLS rules keep sold prices off public sites — ask Krista and she'll email you recent sales for this area.
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