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Cornelia Siem

(She/Her/Hers)
Willis Allen Real Estate
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Recent Sales

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  • $1,164,000
    3 bd3 ba1,964 sqft Spring Valley, CA
    3 bd3 ba1,964 sqft
    Spring Valley, CA
    Sold 9 days ago
    Buyer
    4173 Conrad Dr, Spring Valley, CA, 91977
  • $840,000
    1 bd1 ba1,036 sqft San Diego, CA
    1 bd1 ba1,036 sqft
    San Diego, CA
    Sold 3 months ago
    Seller
    200 Harbor Dr Unit 2603, San Diego, CA, 92101
  • $1,160,000
    3 bd2 ba1,315 sqft San Diego, CA
    3 bd2 ba1,315 sqft
    San Diego, CA
    Sold 7 months ago
    Buyer
    3111 Haidas Ave, San Diego, CA, 92117
  • $2,125,000
    4 bd5 ba3,463 sqft Carlsbad, CA
    4 bd5 ba3,463 sqft
    Carlsbad, CA
    Sold 9 months ago
    Buyer
    2386 Lapis Rd, Carlsbad, CA, 92009
  • $930,000
    2 bd2 ba984 sqft La Jolla, CA
    2 bd2 ba984 sqft
    La Jolla, CA
    Sold 9 months ago
    BuyerSeller
    8153 Via Mallorca, La Jolla, CA, 92037
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11
Sales last 12 months
19
Total sales
$250K-$2.1M
Price range
$996K
Average price

Get to know Cornelia Siem

REALTOR®

Specialties
Buyer's AgentListing AgentRelocationProperty Management

Cornelia Siem's listings & sales (21)

For Sale
For Rent
Sold
This map can show the most recent 100 listings and 100 sales. Review all listings and sales below.

For Sale (2)

Sold (19)

Address
Sold date
Closing price
Represented
Flag Sale
3/25/2026$1,164,000Buyer
12/30/2025$840,000Seller
9/12/2025$1,160,000Buyer
7/21/2025$2,125,000Buyer
7/14/2025$930,000Buyer and Seller

Cornelia Siem's reviews (11)

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  • 5.0
    • 4/24/2025
    • nati18us

    Bought a home in 2025.

    My husband and I have purchased four homes in different cities, and without a doubt, Cornelia has been the most diligent and proactive realtor we’ve ever worked with. Tho...
    My husband and I have purchased four homes in different cities, and without a doubt, Cornelia has been the most diligent and proac...
    5.0
    • 6/30/2023
    • Dillon Davenport

    Bought a home in 2023.

    Cornelia was amazing! I would highly recommend her. She was super knowledgeable about San Diego and hardworking. She helped my wife and I find a great house in a great ne...
    Cornelia was amazing! I would highly recommend her. She was super knowledgeable about San Diego and hardworking. She helped my wif...
  • 5.0
    • 5/23/2023
    • s brayton

    Bought and sold a Single Family home in 2023 in Mira costa, Oceanside, CA.

    I was in a crunch to sell and buy a home. Needless to say I was stressed. Cornelia's professionalism and personal interest in my well being helped take a lot off of my pl...
    I was in a crunch to sell and buy a home. Needless to say I was stressed. Cornelia's professionalism and personal interest in my w...
    5.0
    • 3/9/2023
    • JoaquinFarinas

    Sold a home in 2023.

    Working in the property management industry for 23 years, I can say without reservation or embellishment that Cornelia is a top notch professional in the real estate fiel...
    Working in the property management industry for 23 years, I can say without reservation or embellishment that Cornelia is a top no...
  • 5.0
    • 2/2/2023
    • Sheryl Hunter

    Bought a Condo home in 2023 in North park, San diego, CA.

    Cornelia is an exemplary agent! I have bought and sold several homes, but my latest condo purchase was a new experience for a number of reasons, and it was a very quick c...
    Cornelia is an exemplary agent! I have bought and sold several homes, but my latest condo purchase was a new experience for a numb...
    5.0
    • 12/8/2022
    • Jorge Chacon Cordero

    Bought a Single Family home in 2022 in La mesa, CA.

    Cornelia is an OUTSTANDING Real Estate Agent. She took time to explain the entire buying process from beginning to end, advocating for us every step of the way. She was ...
    Cornelia is an OUTSTANDING Real Estate Agent. She took time to explain the entire buying process from beginning to end, advocatin...
  • 5.0
    • 3/14/2022
    • Nicholas Saccardo

    Bought a Townhouse home in 2022 in Pacific beach, San diego, CA.

    Cornelia did an amazing job with helping me find and close on my first home. She did an awesome job of researching the area, locating comps, and providing me with knowled...
    Cornelia did an amazing job with helping me find and close on my first home. She did an awesome job of researching the area, locat...
    5.0
    • 2/4/2022
    • Meredith Hartle

    Sold a Single Family home in 2021 in North park, San diego, CA.

    Cornelia was such a pleasure to work with. She is very knowledgeable, informative, and communication was very smooth and easy. What separates the good agents from the gre...
    Cornelia was such a pleasure to work with. She is very knowledgeable, informative, and communication was very smooth and easy. Wha...
  • 5.0
    • 9/6/2021
    • tdhughe

    Bought a Apartment home in 2021 in Core-columbia, San diego, CA.

    Cornelia was my realtor and helped me buy a condo downtown. Working with Cornelia was a smooth experience because she is honest, reliable, and has a flexible schedule. ...
    Cornelia was my realtor and helped me buy a condo downtown. Working with Cornelia was a smooth experience because she is honest, ...
    5.0
    • 8/6/2021
    • schoensel

    Bought a Single Family home in 2021 in Eastlake greens, Chula vista, CA.

    Cornelia is a very professional, amicable, extremely knowledgeable, diplomatic, stylish, very bright, and wonderful realtor. She is extremely responsive and anticipates c...
    Cornelia is a very professional, amicable, extremely knowledgeable, diplomatic, stylish, very bright, and wonderful realtor. She i...
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    Cornelia Siem

    (She/Her/Hers)
    Willis Allen Real Estate
    11sales last 12 months
    19total sales
    $250K-$2.1Mprice range
    $996Kaverage price