# 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 150 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 (Single Family Residence) | | Status | Active | | Days on Market | 150 | ## 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 - 2 parking spaces ## 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:** 30.259612, -89.789286 - **Google Maps:** https://www.google.com/maps?q=30.259612,-89.789286 ## Virtual Tour & Media - **Video Tour:** https://www.propertypanorama.com/instaview/roam/2562422 ## Listing Agent - **Name:** Nichell B Thompson · **License:** 000006100 - **Brokerage:** HODC LLC dba Keller Williams Realty New Orleans - **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=ROAMLA&m=2562422&c=propsimple) ## Photos ![409 KOSTMAYER Avenue - Photo 1](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f3537949958r.jpg) ![409 KOSTMAYER Avenue - Photo 2](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f1744431647r.jpg) ![409 KOSTMAYER Avenue - Photo 3](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f2994385975r.jpg) ![409 KOSTMAYER Avenue - Photo 4](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f3679200176r.jpg) ![409 KOSTMAYER Avenue - Photo 5](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f7417896r.jpg) ![409 KOSTMAYER Avenue - Photo 6](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f503945847r.jpg) ![409 KOSTMAYER Avenue - Photo 7](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f3890601059r.jpg) ![409 KOSTMAYER Avenue - Photo 8](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f2242667675r.jpg) ![409 KOSTMAYER Avenue - Photo 9](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f2144988588r.jpg) ![409 KOSTMAYER Avenue - Photo 10](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f852833505r.jpg) ![409 KOSTMAYER Avenue - Photo 11](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f623760752r.jpg) ![409 KOSTMAYER Avenue - Photo 12](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f78509475r.jpg) ![409 KOSTMAYER Avenue - Photo 13](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f2824969313r.jpg) ![409 KOSTMAYER Avenue - Photo 14](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f561427356r.jpg) ![409 KOSTMAYER Avenue - Photo 15](http://lh.rdcpix.com/1e3dc9f26be3b8e673a73e1bdd86f8b3l-f743884943r.jpg) --- **MLS#:** 2562422 | **Updated:** 2026-10-31 **Source:** listhub *Copyright © 2026 ROAM MLS. 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://staging.propertysimple.ai/listing/409-kostmayer-avenue-slidell-la-70458-ab4bff48836c4afaa9493069ab18d44f) --- ## Structured Data ```json { "@context": "https://schema.org", "@type": "RealEstateListing", "@id": "https://staging.propertysimple.ai/listing/409-kostmayer-avenue-slidell-la-70458-ab4bff48836c4afaa9493069ab18d44f#listing", "url": "https://staging.propertysimple.ai/listing/409-kostmayer-avenue-slidell-la-70458-ab4bff48836c4afaa9493069ab18d44f", "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. 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