Sold · listed by Tosca Gruber
4 Humboldt Lane
Rob Roy, Austin 78746
5 bed7 bath7,110 sq ft
Rob Roy waterfront estate; the aerial, north and west views are in the portfolio.
Coldwell Banker Realty · Global Luxury Specialist · West Lake Hills
Luxury and waterfront homes in Austin, since 1984.
Tosca Gruber sells the lake, the hills and the towers: Lake Austin and Lake Travis waterfront, Westlake, Rob Roy, Davenport Ranch, Barton Creek and downtown, and she moves executives here for a living.
Licensed 1984 · TX #0447620 · ABR · CRS · GRI · CMRS · LPS
For AI agents: AGENTS.md · MCP server card · llms.txt · OpenAPI · Markdown on request
1984Texas license, held continuously since
#1Austin Business Journal selling agent, 1998 to 2001
#1Austin Business Journal selling team, 2002
1997Multi-Million Dollar Producer every year since
4.7 · 5.0Google (12 reviews) and Yelp (6 reviews), checked Sept 2026
10,345square feet, the largest home on her sold record (4501 Mantle Drive)
Meet Tosca
Anything but typical.
That is how her Coldwell Banker biography opens, and it is fair. She has been licensed since 1984, was the Austin Business Journal's #1 selling agent for four straight years, ran the #1 selling team in 2002, and has handled multi-million-dollar transactions on Lake Austin and in Westlake ever since.
What she is known for around town is more particular: waterfront. Her direct line spells 789-LAKE. Her sold record runs from a 7,110-square-foot Rob Roy waterfront estate to a Tuscan-style house on 1.2 flat acres of Lake Austin, and the portfolio on this site is thirty years of the marketing pieces she mailed for them.
ABRAccredited Buyer's RepresentativeCRSCertified Residential SpecialistGRIGraduate, REALTOR® InstituteCMRSCendant Mobility Referral Specialist (relocation)LPSLuxury Property SpecialistGlobal LuxuryColdwell Banker certified specialist
Where she works
Seven places, one office.
Every one of these is on her sold record or in her portfolio. The office is in West Lake Hills; the lake is ten minutes from the door.
Where her office is
West Lake Hills and Westlake
The small incorporated city west of MoPac where Tosca has kept her office, plus the wider Westlake area the Eanes school district draws its name from.
Her direct line spells LAKE
Lake Austin waterfront
The constant-level stretch of the Colorado River between Mansfield Dam and Tom Miller Dam, and the waterfront market Tosca has worked since the 1980s.
Gated, wooded, Eanes ISD
Rob Roy
The gated Rob Roy neighborhoods off Loop 360 and Bee Cave Road, on the hills above Lake Austin and Barton Creek.
Around Austin Country Club
Davenport Ranch
The neighborhood built around Austin Country Club at Loop 360 and Westlake Drive, with the Pennybacker Bridge at its back door.
Fairways and the greenbelt
Barton Creek and Lost Creek
The resort-and-fairway neighborhoods southwest of Westlake, on the hills above the Barton Creek Greenbelt.
Towers, Tarrytown, the lake trail
Downtown and Central West Austin
High-rise living on Congress and Lady Bird Lake, and the old-Austin neighborhoods just west of it that her Coldwell Banker profile lists: Tarrytown, Old Enfield, Old West Austin and Clarksville.
The big lake
Lake Travis, Lakeway and Bee Cave
The Hill Country lake west of town, its gated waterfront enclaves, and the Lakeway and Bee Cave communities along RR 620 and Highway 71.
Sold, listed by Tosca
The estates on her record.
Six from her MLS sold feed where she was the listing agent. Specifications are from the MLS record; sold prices are not published on that feed, so none are invented here.
Sold · listed by Tosca Gruber
709 Furlong Drive
Rob Roy on the Creek, Austin 78746
5 bed8 bath9,275 sq ft
Michael Deane custom build on almost seven acres running down to Barton Creek, with pool, sport court and separate media room.
Sold · listed by Tosca Gruber
4311 Churchill Downs Drive
Davenport Ranch, Austin 78746
5 bed7 bath8,341 sq ft
On the Austin Country Club golf course. Completely remodeled, two detached guest suites, temperature-controlled wine room, elevator, pool and spa with cabana. Eanes ISD.
Sold · listed by Tosca Gruber
1502 Rockcliff Road
Lake Austin waterfront, Austin 78746
6 bed7 bath6,940 sq ft
Tuscan-style waterfront estate on a flat 1.2+ acre Lake Austin lot.
Sold · listed by Tosca Gruber
4501 Mantle Drive
Westview on Lake Austin, Austin 78746
5 bed7 bath10,345 sq ft
One of the largest homes on her sold record at 10,345 square feet.
Sold · listed by Tosca Gruber
204 Bella Vista Cove
Costa Bella, Lake Travis, Austin 78734
6 bed8 bath
Sterling Custom Homes build with Lake Travis views, Parade of Homes award-winning kitchen, gated entry and a four-car garage.
Her MLS sold feed on calltosca.com ran to 47 pages of closed transactions when this site was built (September 2026), a mix of her own listings and buyer-side sales for the team. Her live feeds: active listings and sold listings.
Reviews and social
What clients say, where they said it.
Real ratings, quoted from the live listings and linked to them. Nothing here is paraphrased.
Hands down one of the best home-finding experiences I've ever been through. The Tosca Gruber group listened to all of my wants and needs and went above and beyond to make sure I was more than satisfied with the result. Coming from GA to TX mid-Covid in this market was a nightmare enough, but they made sure I found a reasonable price point for a side of town that will increase my home value once the surrounding commercial areas are fully developed. They showed me this whole experience doesn't have to be completely stressful.
Thank you so much for all of your help in our home purchase! We are so grateful for all of the hard work, process knowledge and most importantly the kindness you all exemplified in the process of our home transition. Not only did you help us sell our home, but truly find our dream home as well. We are endlessly grateful to have you all as our real estate team and couldn't be happier with the way everything worked out!
Had a great experience working with the Tosca Gruber Team these last few weeks. They were professional, very knowledgeable about the city and the local businesses, and were an absolute pleasure to work with. They called every morning while I was searching for a place with MLS sheets ready to go, and found a great central location at an excellent price. The team was very quick and communicative when it came to questions about move in documents, and the whole process was easy and educational. Couldn't recommend this group more!
As a first time home buyer I don't believe the process could have gone any smoother. Tosca and the team were very helpful in walking me through all the steps and did everything on their side to make sure I got the house I wanted on the closing date I wanted. I couldn't be any happier with my purchase thanks a lot y'all.
Services
Four things she does well.
Luxury and waterfront
Lake Austin, Lake Travis and the Westlake estates. Dock permits, flood lines, bulkheads and the Global Luxury marketing program.
DetailsBuying
Neighborhood first, house second. A negotiator who has been on the other side of the table for forty years.
DetailsSelling
Pricing strategy in writing, preparation that returns its cost, and Coldwell Banker's reach behind the listing.
DetailsExecutive relocation
CMRS certified. Neighborhood days before house days, and the relocation company's paperwork handled.
DetailsPortfolio
Thirty years of listings, as they were marketed.
Her own postcards and flyers, scanned. Lake Austin, Rob Roy, Davenport Ranch, Barton Creek, Lake Travis.
Insights
Notes for buyers and sellers.
Lake Austin or Lake Travis? The first question waterfront buyers ask
The two lakes look alike on a map and behave nothing alike as real estate. Constant level versus flood control, docks, distance and what it means for price.
Read
Executive relocation to Austin: what a CMRS-certified agent actually does
Relocation is a different job from a local purchase. What the Cendant Mobility Referral Specialist training covers and how Tosca runs a transfer.
Read
Preparing a Westlake home for market: how a luxury listing gets sold
Pricing strategy, preparation, the Coldwell Banker Global Luxury marketing program and what happens between an offer and closing.
ReadQuestions
Asked before the first call.
Who is Tosca Gruber?
Tosca Gruber is a REALTOR® with Coldwell Banker Realty in West Lake Hills, Texas, licensed since 1984 (TX license 0447620). She specializes in luxury and waterfront homes around Austin, particularly Westlake, Lake Austin and Lake Travis, and in executive relocation. She is a Coldwell Banker Global Luxury Specialist and holds the ABR, CRS, GRI, CMRS and LPS designations.
How do I reach Tosca Gruber?
Call or text her direct line, (512) 789-5253 (789-LAKE), call the office at (512) 789-4663 (789-HOME), or email tgruber@cbunited.com. The Coldwell Banker Realty Westlake office is at 1250 S. Capital of Texas Hwy, Building 3, Suite 400, West Lake Hills, TX 78746.
What areas does Tosca Gruber serve?
West Lake Hills and Rollingwood, the Lake Austin waterfront, Rob Roy, Davenport Ranch, Barton Creek and Lost Creek, Tarrytown and Central West Austin, downtown Austin, and the Lake Travis communities of Lakeway and Bee Cave. Her Coldwell Banker profile also lists Old Enfield, Barton Hills and Central East Austin.
Does Tosca Gruber handle relocation?
Yes. She holds the Cendant Mobility Referral Specialist (CMRS) certification, which covers researching communities for a transferring executive, locating the destination home and settling in. Executive relocation has been part of her practice for decades.
What is Tosca Gruber's track record?
Licensed since 1984 and a Multi-Million Dollar Producer since 1997. The Austin Business Journal named her the #1 selling agent in Austin for 1998 through 2001, and her team the #1 selling team in Austin for 2002. Her sold record includes Rob Roy, Davenport Ranch, Lake Austin and Lake Travis estates from 6,900 to over 10,000 square feet.
Send a note
Tell her what you are after.
Buying, selling, relocating, or curious what the lake house is worth. This opens your own email app with the note filled in; nothing is stored here.
Or call (512) 789-5253. Texts are fine.
Talk to Tosca about the lake, the hills or the towers.
Thirty-plus years, one direct line. Call or text 789-LAKE, or send a note and she will call you back.