# 409 KOSTMAYER Avenue, Slidell, LA 70458 > **TL;DR:** 3bd/2ba single family, $110,000 ($128/sqft), built 1950, 858 sqft. > A/C. Est. $588/mo. Listed 103 days. ## Property at a Glance | Attribute | Value | |-----------|-------| | Price | $110,000 | | Price/sqft | $128 | | Bedrooms | 3 | | Bathrooms | 1 full, 1 half | | Square Feet | 858 | | Year Built | 1950 | | Lot Size | 11,761 sqft (0.27 acres) | | Stories | 1 | | Property Type | Single Family (Other) | | Status | Active | | Days on Market | 103 | ## Estimated Monthly Costs | Category | Amount | |----------|--------| | Principal & Interest (20% down, 30-year at 6.5%) | $556 | | Estimated Insurance | $32 | | **Total** | **$588** | ## Key Amenities - A/C ## Property Highlights - Built in 1950 - 0.27 acre lot ## Description ### Agent Description Slidell Charmer with Bonus Efficiency Apartment in Sought-After Salmen Addition! Don't miss this well-appointed 3-bedroom, 1.5-bath home nestled in the established Salmen Addition neighborhood of Slidell. Whether you're a first-time buyer, investor, or savvy homeowner looking to offset your mortgage, this property delivers incredible value and versatility. The standout feature? A fully self-contained mother-in-law/efficiency apartment, perfect for extended family or out-of-town guests Step outside and enjoy the generous covered patio, an ideal spot for entertaining, relaxing, or simply soaking in the Louisiana lifestyle year-round rain or shine. This home offers the kind of quiet, established neighborhood feel that buyers are always searching for. Schedule your showing today before this one is gone! ## Location - **Address:** 409 KOSTMAYER Avenue, Slidell, LA 70458 - **County:** St. Tammany - **Neighborhood:** Salmen Addition - **Coordinates:** 30.259628, -89.789278 - **Google Maps:** https://www.google.com/maps?q=30.259628,-89.789278 ## Listing Agent - **Name:** Nichell Thompson - **Brokerage:** HODC LLC dba Keller Williams Realty New Orleans - **Phone:** 5042615182 - **Broker Phone:** (504) 862-0100 - **Listing URL:** [View original listing](https://www.realtor.com/realestateandhomes-detail/409-Kostmayer-Ave_Slidell_LA_70458_M82456-88757?f=listhub&s=NOMARLA&m=2562422&c=propsimple) ## Photos ![409 KOSTMAYER Avenue - Photo 1](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f3928216369r.jpg) ![409 KOSTMAYER Avenue - Photo 2](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f3331766276r.jpg) ![409 KOSTMAYER Avenue - Photo 3](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f849626180r.jpg) ![409 KOSTMAYER Avenue - Photo 4](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f1237533500r.jpg) ![409 KOSTMAYER Avenue - Photo 5](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f1653543108r.jpg) ![409 KOSTMAYER Avenue - Photo 6](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f3722177064r.jpg) ![409 KOSTMAYER Avenue - Photo 7](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f3724178274r.jpg) ![409 KOSTMAYER Avenue - Photo 8](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f3935889980r.jpg) ![409 KOSTMAYER Avenue - Photo 9](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f573062878r.jpg) ![409 KOSTMAYER Avenue - Photo 10](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f1444744697r.jpg) ![409 KOSTMAYER Avenue - Photo 11](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f3544176880r.jpg) ![409 KOSTMAYER Avenue - Photo 12](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f4249362174r.jpg) ![409 KOSTMAYER Avenue - Photo 13](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f1783181887r.jpg) ![409 KOSTMAYER Avenue - Photo 14](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f3243401462r.jpg) ![409 KOSTMAYER Avenue - Photo 15](http://lh.rdcpix.com/c9f4246a4ec3683677110463e68ca522l-f3436530054r.jpg) --- **MLS#:** 2562422 | **Updated:** 2026-07-02 **Source:** listhub *Copyright © 2026 New Orleans Metropolitan Association of REALTORS®. All rights reserved. All information provided by the listing agent/broker is deemed reliable but is not guaranteed and should be independently verified.* [View on PropertySimple](https://www.propertysimple.ai/listing/409-kostmayer-avenue-slidell-la-70458-2562422) --- ## Structured Data ```json { "@context": "https://schema.org", "@type": "RealEstateListing", "@id": "https://www.propertysimple.ai/listing/409-kostmayer-avenue-slidell-la-70458-2562422#listing", "url": "https://www.propertysimple.ai/listing/409-kostmayer-avenue-slidell-la-70458-2562422", "name": "409 KOSTMAYER Avenue, Slidell, LA 70458", "description": "Slidell Charmer with Bonus Efficiency Apartment in Sought-After Salmen Addition! Don't miss this well-appointed 3-bedroom, 1.5-bath home nestled in the established Salmen Addition neighborhood of Slidell. Whether you're a first-time buyer, investor, or savvy homeowner looking to offset your mortgage, this property delivers incredible value and versatility. 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