Seller's Agent in 2025
Debbie Monceaux
Klemm Real Estate
(209) 815-6785
1 in this area
68 Total Sales
3955 Rancho Diablo Rd Byron, CA 94514
East Contra Costa Neighborhood
3
Beds
2.5
Baths
3,426
Sq Ft
5.2
Acres
Highlights
- Horses Allowed On Property
- Spa
- Panoramic View
- Discovery Bay Elementary School Rated A-
- RV Access or Parking
- Custom Home
About This Home
As of July 2025Stunning 3426 sq ft Custom Home on 5.2-Fenced Acres. Beautifully appointed home with fantastic views, a front porch, circular driveway, formal living & dining rooms, oversized great room, soaring ceilings, gas fireplace, French doors open on to a back porch that over looks huge 2400 sq ft patio, spa, fountain & fenced acreage. All of the spacious bedrooms are downstairs w/ensuite baths, plantation shutters & large closets. There is a versatile upstairs loft that could double as a game room, 4th bedroom, gym or home office & includes a large temperature controlled storage room. The kitchen has a center island, pendant lights, granite countertops, SS appliances, a 6-burner gas cooktop, built-in fridge, pro style range hood, pull-out shelving & under cabinet lighting. The large laundry room has an exterior door, includes washer/dryer, sink & lots of cabinets. Mudroom area has a bench & storage, plus a tech desk/drop zone. The cul-de-sac street enhances privacy. Other features include: Irrigation lines run to field, auto sprinklers for landscaped front & backyard spaces, oversized gates for equipt/RV access, All Newer:Roof, HVAC System, RO sys, Water heater Well pump, Oven/Microwave- Other features include 1/2 bath, sheds, surround sound, custom window coverings & more! VA buyers OK
Last Agent to Sell the Property
Klemm Real Estate License #01413579 Listed on: 03/20/2025
Last Buyer's Agent
Moe Yousofi
Redfin License #01420987
Home Details
Home Type
- Single Family
Year Built
- Built in 2002 | Remodeled
Lot Details
- 5.2 Acre Lot
- Cul-De-Sac
- Street terminates at a dead end
- Kennel or Dog Run
- Back Yard Fenced
- Landscaped
- Private Lot
- Front and Back Yard Sprinklers
- Manual Sprinklers System
- Property is zoned RUR HMST
Parking
- 2 Car Attached Garage
- 2 Open Parking Spaces
- Inside Entrance
- Side Facing Garage
- Side by Side Parking
- Garage Door Opener
- Gravel Driveway
- RV Access or Parking
Property Views
- Panoramic
- Pasture
- Hills
Home Design
- Custom Home
- 2-Story Property
- Traditional Architecture
- Ranch Property
- Slab Foundation
- Frame Construction
- Blown Fiberglass Insulation
- Ceiling Insulation
- Composition Roof
- Stucco
Interior Spaces
- 3,426 Sq Ft Home
- Wired For Sound
- Cathedral Ceiling
- Ceiling Fan
- Gas Log Fireplace
- Double Pane Windows
- ENERGY STAR Qualified Windows with Low Emissivity
- Window Treatments
- Window Screens
- Formal Entry
- Family Room with Fireplace
- Great Room
- Combination Kitchen and Living
- Formal Dining Room
- Loft
- Storage Room
Kitchen
- Breakfast Area or Nook
- Breakfast Bar
- Built-In Electric Oven
- Self-Cleaning Oven
- Gas Cooktop
- Range Hood
- Microwave
- Built-In Refrigerator
- Plumbed For Ice Maker
- Dishwasher
- Kitchen Island
- Granite Countertops
- Compactor
- Disposal
Flooring
- Engineered Wood
- Carpet
Bedrooms and Bathrooms
- 3 Bedrooms
- Primary Bedroom on Main
- Separate Bedroom Exit
- Walk-In Closet
- Primary Bathroom is a Full Bathroom
- Jack-and-Jill Bathroom
- Split Bathroom
- Tile Bathroom Countertop
- Secondary Bathroom Double Sinks
- Low Flow Toliet
- Soaking Tub
- Bathtub with Shower
- Multiple Shower Heads
- Separate Shower
- Low Flow Shower
- Window or Skylight in Bathroom
Laundry
- Laundry Room
- Laundry on main level
- Dryer
- Washer
- Sink Near Laundry
- Laundry Cabinets
- 220 Volts In Laundry
Home Security
- Security System Owned
- Carbon Monoxide Detectors
- Fire and Smoke Detector
Eco-Friendly Details
- Energy-Efficient Appliances
- Energy-Efficient Construction
- Energy-Efficient Insulation
- Energy-Efficient Doors
- ENERGY STAR Qualified Equipment for Heating
- Energy-Efficient Thermostat
Outdoor Features
- Spa
- Patio
- Fire Pit
- Shed
- Front Porch
Horse Facilities and Amenities
- Horses Allowed On Property
Utilities
- Forced Air Zoned Heating and Cooling System
- Refrigerated and Evaporative Cooling System
- Cooling System Powered By Renewable Energy
- Dual Heating Fuel
- Heating System Uses Propane
- Underground Utilities
- 220 Volts in Kitchen
- Gas Tank Leased
- Water Filtration System
- Well
- Gas Water Heater
- High Speed Internet
- Multiple Phone Lines
- Cable TV Available
Community Details
- No Home Owners Association
- Net Lease
Listing and Financial Details
- Assessor Parcel Number 002-270-004-1
Ownership History
Date
Name
Owned For
Owner Type
Purchase Details
Listed on
Mar 20, 2025
Closed on
Jun 18, 2025
Sold by
Rosenberg Joel E and Ratner Irene Jill
Bought by
Ong Winson and Leong Mary
Seller's Agent
Debbie Monceaux
Klemm Real Estate
Buyer's Agent
Moe Yousofi
Redfin
List Price
$1,650,000
Sold Price
$1,550,000
Premium/Discount to List
-$100,000
-6.06%
Views
69
Current Estimated Value
Home Financials for this Owner
Home Financials are based on the most recent Mortgage that was taken out on this home.
Estimated Appreciation
$172,308
Avg. Annual Appreciation
28.53%
Original Mortgage
$1,240,000
Outstanding Balance
$1,234,911
Interest Rate
5.88%
Mortgage Type
New Conventional
Estimated Equity
$487,397
Purchase Details
Listed on
Jan 28, 2020
Closed on
Nov 10, 2020
Sold by
Pirnik Gregory and Pirnik Tammy L
Bought by
Rosenberg Joel E and Ratner Irene Jill
Seller's Agent
Emilio Leypon
EXP Realty
List Price
$1,599,000
Sold Price
$1,429,000
Premium/Discount to List
-$170,000
-10.63%
Home Financials for this Owner
Home Financials are based on the most recent Mortgage that was taken out on this home.
Avg. Annual Appreciation
1.77%
Original Mortgage
$429,000
Interest Rate
2.37%
Mortgage Type
New Conventional
Purchase Details
Closed on
Jul 21, 2000
Sold by
Pontes Richard and Rubino Pontes Marian
Bought by
Pirnik Gregory and Pirnik Tammy L
Purchase Details
Closed on
Dec 17, 1999
Sold by
Land Factors Inc
Bought by
Pontes Richard and Rubino Pontes Marian
Home Financials for this Owner
Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$120,000
Interest Rate
7.69%
Mortgage Type
Seller Take Back
Create a Home Valuation Report for This Property
The Home Valuation Report is an in-depth analysis detailing your home's value as well as a comparison with similar homes in the area
Home Values in the Area
Average Home Value in this Area
Purchase History
| Date | Type | Sale Price | Title Company |
|---|---|---|---|
| Grant Deed | $1,550,000 | Old Republic Title | |
| Grant Deed | $1,429,000 | Old Republic Title Company | |
| Individual Deed | $165,000 | North American Title Co | |
| Corporate Deed | $170,000 | North American Title Co |
Source: Public Records
Mortgage History
| Date | Status | Loan Amount | Loan Type |
|---|---|---|---|
| Open | $1,240,000 | New Conventional | |
| Previous Owner | $429,000 | New Conventional | |
| Previous Owner | $120,000 | Seller Take Back |
Source: Public Records
Property History
| Date | Event | Price | List to Sale | Price per Sq Ft | Prior Sale |
|---|---|---|---|---|---|
| 07/07/2025 07/07/25 | Sold | $1,550,000 | -6.1% | $452 / Sq Ft | |
| 05/30/2025 05/30/25 | Pending | -- | -- | -- | |
| 03/20/2025 03/20/25 | For Sale | $1,650,000 | +15.5% | $482 / Sq Ft | |
| 11/16/2020 11/16/20 | Sold | $1,429,000 | -10.6% | $401 / Sq Ft | View Prior Sale |
| 09/29/2020 09/29/20 | Pending | -- | -- | -- | |
| 01/28/2020 01/28/20 | For Sale | $1,599,000 | -- | $449 / Sq Ft |
Source: MetroList
Tax History Compared to Growth
Tax History
| Year | Tax Paid | Tax Assessment Tax Assessment Total Assessment is a certain percentage of the fair market value that is determined by local assessors to be the total taxable value of land and additions on the property. | Land | Improvement |
|---|---|---|---|---|
| 2025 | $18,007 | $1,546,793 | $989,341 | $557,452 |
| 2024 | $16,698 | $1,516,465 | $969,943 | $546,522 |
| 2023 | $16,698 | $1,486,731 | $950,925 | $535,806 |
| 2022 | $17,472 | $1,457,580 | $932,280 | $525,300 |
| 2021 | $17,059 | $1,429,000 | $914,000 | $515,000 |
| 2019 | $8,480 | $634,446 | $235,860 | $398,586 |
| 2018 | $8,215 | $622,007 | $231,236 | $390,771 |
| 2017 | $8,104 | $609,811 | $226,702 | $383,109 |
| 2016 | $7,825 | $597,855 | $222,257 | $375,598 |
| 2015 | -- | $588,876 | $218,919 | $369,957 |
| 2014 | $7,676 | $577,342 | $214,631 | $362,711 |
Source: Public Records
Agents Affiliated with this Home
-
Debbie Monceaux
-
Moe Yousofi
M
Buyer's Agent in 2025
Moe Yousofi
Redfin
(925) 997-7338
3 in this area
147 Total Sales
-
E
Seller's Agent in 2020
Emilio Leypon
EXP Realty
Map
Source: MetroList
MLS Number: 225021509
APN: 002-270-004-1
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