5,028

Taneytown, MD Homes

Section Image
  • 98 Kenan St, Taneytown, MD 21787
    98 Kenan St, Taneytown, MD 21787
    98 Kenan St, Taneytown, MD 21787
    /27

    $425,000 Sold Aug 11, 2025

    98 Kenan St, Taneytown, MD 21787

    • 4 Beds
    • 2.5 Baths
    • 1,932 Sq Ft
    • Built 1996

    Last Sold Summary

    • $220/SF
    • 3 Days On Market

    Current Estimated Value $421,527

    Last Listing Agent Britten Musser Hagan Realty

    98 Kenan St, Taneytown, MD 21787
    • 315 Clubside Dr, Taneytown, MD 21787
      315 Clubside Dr, Taneytown, MD 21787
      315 Clubside Dr, Taneytown, MD 21787
      /31

      Est $457,427 Not Listed For Sale

      • 2 Beds
      • 2.5 Baths
      • 2,504 Sq Ft

      315 Clubside Dr, Taneytown, MD 21787

      315 Clubside Dr, Taneytown, MD 21787
  • 2100 Blacks School House Rd, Taneytown, MD 21787
    2100 Blacks School House Rd, Taneytown, MD 21787
    2100 Blacks School House Rd, Taneytown, MD 21787
    /51

    $620,000

    • 3 Beds
    • 1.5 Baths
    • 2,274 Sq Ft

    2100 Blacks School House Rd, Taneytown, MD 21787

    Are you ready for more space? Are you ready to follow that dream and own a farm? Now is your chance to make that dream a reality! This updated, upgraded, and uplifting farmhouse sits on 10+ stunning acres with a creek running along a corner of the property. This wonderful home offers everything you need. The beautifully renovated 3-bedroom, 1.5-bath home features a brand-new kitchen with updated

    Caron Prideaux Redfin Corp

    2100 Blacks School House Rd, Taneytown, MD 21787
  • 5211 Harney Rd, Taneytown, MD 21787
    5211 Harney Rd, Taneytown, MD 21787
    5211 Harney Rd, Taneytown, MD 21787
    /21

    $420,000 Sold Sep 10, 2025

    5211 Harney Rd, Taneytown, MD 21787

    • 4 Beds
    • 2 Baths
    • 1,724 Sq Ft
    • Built 1971

    Last Sold Summary

    • $244/SF
    • 88 Days On Market

    Current Estimated Value $423,006

    Last Listing Agent Pam Reed Berkshire Hathaway HomeServices Homesale Realty

    5211 Harney Rd, Taneytown, MD 21787
    • 551 Daisy Dr, Taneytown, MD 21787
      551 Daisy Dr, Taneytown, MD 21787
      551 Daisy Dr, Taneytown, MD 21787
      /33

      Est $242,314 Not Listed For Sale

      • 3 Beds
      • 1.5 Baths
      • 1,152 Sq Ft

      551 Daisy Dr, Taneytown, MD 21787

      551 Daisy Dr, Taneytown, MD 21787
  • 3444 Old Taneytown Rd, Taneytown, MD 21787
    3444 Old Taneytown Rd, Taneytown, MD 21787
    3444 Old Taneytown Rd, Taneytown, MD 21787
    /7

    $299,900 Pending

    • 4 Beds
    • 1 Bath
    • 1,796 Sq Ft

    3444 Old Taneytown Rd, Taneytown, MD 21787

    This price is for a Potential Short Sale! Spacious 4 bedroom rancher nestled on a serene .91-acre lot with pastoral rural views. Features a country kitchen with large island and abundant cabinetry, skylights, vaulted beamed ceilings in the living room, sunroom with main-level laundry hook-up, and a huge family room with stone fireplace (propane hookup) and custom built-ins. Enjoy a 4-car attached

    Stephanie Myers Long & Foster Real Estate, Inc.

    3444 Old Taneytown Rd, Taneytown, MD 21787
  • 102 Saddletop Dr, Taneytown, MD 21787
    102 Saddletop Dr, Taneytown, MD 21787
    /2

    $385,000 Sold Mar 31, 2025

    102 Saddletop Dr, Taneytown, MD 21787

    • 2 Beds
    • 2 Baths
    • 1,612 Sq Ft
    • Built 2004

    Last Sold Summary

    • $239/SF
    • 187 Days On Market

    Current Estimated Value $389,029

    Last Listing Agent Gwenn Bockelmann RE/MAX Advantage Realty

    102 Saddletop Dr, Taneytown, MD 21787
    • 5914 Conover Rd, Taneytown, MD 21787
      5914 Conover Rd, Taneytown, MD 21787
      5914 Conover Rd, Taneytown, MD 21787
      /27

      Est $294,526 Not Listed For Sale

      • 2 Beds
      • 1 Bath
      • 1,092 Sq Ft

      5914 Conover Rd, Taneytown, MD 21787

      5914 Conover Rd, Taneytown, MD 21787
  • 172 Saddletop Dr, Taneytown, MD 21787
    172 Saddletop Dr, Taneytown, MD 21787
    172 Saddletop Dr, Taneytown, MD 21787
    /38

    $319,900

    • 1 Bed
    • 2 Baths
    • 1,419 Sq Ft

    172 Saddletop Dr, Taneytown, MD 21787

    Welcome to carefree living in this charming ranch-style townhome located in the vibrant 55+ Carroll Vista community! This beautifully maintained home features a country eat-in kitchen, perfect for casual meals, plus a dedicated office ideal for work or hobbies. The open-concept dining and family room boasts soaring ceilings, a cozy gas fireplace, and flows seamlessly into a bright sunroom — the

    Stephanie Myers Long & Foster Real Estate, Inc.

    172 Saddletop Dr, Taneytown, MD 21787
  • 105 Carnival Dr, Taneytown, MD 21787
    105 Carnival Dr, Taneytown, MD 21787
    105 Carnival Dr, Taneytown, MD 21787
    /35

    $225,000 Sold Jan 22, 2026

    105 Carnival Dr, Taneytown, MD 21787

    • 3 Beds
    • 1.5 Baths
    • 1,032 Sq Ft
    • Built 1980

    Last Sold Summary

    • $218/SF
    • 2 Days On Market

    Last Listing Agent Betty Franco Kniskern Keller Williams Flagship

    105 Carnival Dr, Taneytown, MD 21787
    • 114 Carnival Dr, Taneytown, MD 21787
      114 Carnival Dr, Taneytown, MD 21787
      114 Carnival Dr, Taneytown, MD 21787
      /25

      Est $238,392 Not Listed For Sale

      • 3 Beds
      • 1 Bath
      • 1,032 Sq Ft

      114 Carnival Dr, Taneytown, MD 21787

      114 Carnival Dr, Taneytown, MD 21787
  • 3989 Kump Station Rd, Taneytown, MD 21787
    3989 Kump Station Rd, Taneytown, MD 21787
    3989 Kump Station Rd, Taneytown, MD 21787
    /106

    $1,399,900

    • 3 Beds
    • 3.5 Baths
    • 4,008 Sq Ft

    3989 Kump Station Rd, Taneytown, MD 21787

    Welcome to your private retreat in the heart of Carroll County! Nestled on 35.9 secluded acres not in ag preservation, this exceptional property combines country living with luxury amenities. The 4,000+ finished sqft residence showcases cherry hardwood floors, an expansive country kitchen with granite countertops, island, stainless steel appliances, and a sunny dining area with a bow window open

    Stephanie Myers Long & Foster Real Estate, Inc.

    3989 Kump Station Rd, Taneytown, MD 21787
  • 311 Clubside Dr, Taneytown, MD 21787
    311 Clubside Dr, Taneytown, MD 21787
    311 Clubside Dr, Taneytown, MD 21787
    /37

    $450,000 Sold Apr 30, 2025

    311 Clubside Dr, Taneytown, MD 21787

    • 2 Beds
    • 2.5 Baths
    • 2,458 Sq Ft
    • Built 2007

    Last Sold Summary

    • $183/SF
    • 0 Days On Market

    Current Estimated Value $452,684

    Last Listing Agent Chris Ciccarelli Berkshire Hathaway HomeServices Homesale Realty

    311 Clubside Dr, Taneytown, MD 21787
    • 3061 Kump Station Rd, Taneytown, MD 21787
      3061 Kump Station Rd, Taneytown, MD 21787
      3061 Kump Station Rd, Taneytown, MD 21787
      /89

      Est $819,522 Not Listed For Sale

      • 4 Beds
      • 3 Baths
      • 2,344 Sq Ft

      3061 Kump Station Rd, Taneytown, MD 21787

      3061 Kump Station Rd, Taneytown, MD 21787
  • 547 Kenan St, Taneytown, MD 21787
    547 Kenan St, Taneytown, MD 21787
    547 Kenan St, Taneytown, MD 21787
    /36

    $399,900

    • 3 Beds
    • 3 Baths
    • 1,796 Sq Ft

    547 Kenan St, Taneytown, MD 21787

    Come see this gorgeous updated split level in Meadowbrooke one of Taneytown's most desired communities. This home is on a private driveway backing to a farm. You will love the updated kitchen with large island, stainless appliances and quartz counters. Luxury Vinyl flooring on the main level and new carpet throughout. 3 full baths that have been tastefully updated. Enjoy the private deck

    vicki eisenhardt ExecuHome Realty

    547 Kenan St, Taneytown, MD 21787
  • 189 Bentley St, Taneytown, MD 21787
    189 Bentley St, Taneytown, MD 21787
    189 Bentley St, Taneytown, MD 21787
    /35

    $405,000 Sold Mar 28, 2025

    189 Bentley St, Taneytown, MD 21787

    • 3 Beds
    • 2 Baths
    • 2,128 Sq Ft
    • Built 2004

    Last Sold Summary

    • $190/SF
    • 2 Days On Market

    Current Estimated Value $407,480

    Last Listing Agent Stacy Zaminski Iron Valley Real Estate of Central PA

    189 Bentley St, Taneytown, MD 21787
    • 303 Clubside Dr, Taneytown, MD 21787
      303 Clubside Dr, Taneytown, MD 21787
      303 Clubside Dr, Taneytown, MD 21787
      /27

      Est $391,954 Not Listed For Sale

      • 2 Beds
      • 2 Baths
      • 1,404 Sq Ft

      303 Clubside Dr, Taneytown, MD 21787

      303 Clubside Dr, Taneytown, MD 21787
  • 0 Harney Rd, Taneytown, MD
    0 Harney Rd, Taneytown, MD
    0 Harney Rd, Taneytown, MD
    /11

    $100,000

    • Land
    • 0.46 Acre
    • $217,391 per Acre

    0 Harney Rd, Taneytown, MD

    Wonderful level lot just outside of the Taneytown Historic district, and within City limits. Great opportunity to possibly build your dream home, or maybe subdivide and build two houses. Water and sewer service are available to the area. Zoning information for R-7500 is included in the "Document" section of this listing.

    Christopher Fuller Long & Foster Real Estate, Inc.

    0 Harney Rd, Taneytown, MD
  • 330 Roberts Mill Rd, Taneytown, MD 21787
    330 Roberts Mill Rd, Taneytown, MD 21787
    330 Roberts Mill Rd, Taneytown, MD 21787
    /31

    $328,000 Sold Apr 29, 2025

    330 Roberts Mill Rd, Taneytown, MD 21787

    • 3 Beds
    • 1 Bath
    • 1,860 Sq Ft
    • Built 1960

    Last Sold Summary

    • $176/SF
    • 41 Days On Market

    Current Estimated Value $331,635

    Last Listing Agent John Hallis The KW Collective

    330 Roberts Mill Rd, Taneytown, MD 21787
    • 215 Clubside Dr, Taneytown, MD 21787
      215 Clubside Dr, Taneytown, MD 21787
      215 Clubside Dr, Taneytown, MD 21787
      /42

      Est $465,832 Not Listed For Sale

      • 3 Beds
      • 3 Baths
      • 2,036 Sq Ft

      215 Clubside Dr, Taneytown, MD 21787

      215 Clubside Dr, Taneytown, MD 21787
  • 0 Carnival Dr, Taneytown, MD 21787
    0 Carnival Dr, Taneytown, MD 21787
    0 Carnival Dr, Taneytown, MD 21787
    /22

    $349,997

    • Land
    • 3.47 Acres
    • $100,864 per Acre

    0 Carnival Dr, Taneytown, MD 21787

    Explore the potential of this 3.74-acre commercial lot in Taneytown, offering a prime location for your builder or developer clients. Accessible via Carnival Drive, the site holds promise with available water and sewer connections per the Seller. The seller believes there is a possibility of access to Antrim Rd and is open to holding financing for qualified Buyers. Verify land use possibilities

    Russ Dukan Allfirst Realty, Inc.

    0 Carnival Dr, Taneytown, MD 21787
  • 11 Starboard Dr, Taneytown, MD 21787
    11 Starboard Dr, Taneytown, MD 21787
    11 Starboard Dr, Taneytown, MD 21787
    /26

    $362,500 Sold Dec 19, 2025

    11 Starboard Dr, Taneytown, MD 21787

    • 4 Beds
    • 2 Baths
    • 1,456 Sq Ft
    • Built 1986

    Last Sold Summary

    • $249/SF
    • 128 Days On Market

    Last Listing Agent Jon Leary Cummings & Co. Realtors

    11 Starboard Dr, Taneytown, MD 21787
    • 408 E Baltimore St, Taneytown, MD 21787
      408 E Baltimore St, Taneytown, MD 21787
      408 E Baltimore St, Taneytown, MD 21787
      /49

      Est $348,338 Not Listed For Sale

      • 3 Beds
      • 1.5 Baths
      • 1,753 Sq Ft

      408 E Baltimore St, Taneytown, MD 21787

      408 E Baltimore St, Taneytown, MD 21787
  • 3820 Kump Station Rd, Taneytown, MD 21787
    3820 Kump Station Rd, Taneytown, MD 21787
    3820 Kump Station Rd, Taneytown, MD 21787
    /60

    $364,900

    • 3 Beds
    • 1 Bath
    • 1,232 Sq Ft

    3820 Kump Station Rd, Taneytown, MD 21787

    Country roads lead you home to 3820 Kump Station Rd. This charming brick rancher is nestled on a peaceful, partly wooded lot, between Taneytown and Littlestown. Tasteful updates inside blend with the warmth of wood floors that run throughout the home. Enjoy the best of every season when you relax on 2 level deck on warm days or unwind in the romantic winter igloo on crisp, chilly nights. The home

    Melissa Divers-Reed RE/MAX Solutions

    3820 Kump Station Rd, Taneytown, MD 21787
  • 2 Zephyr Ct, Taneytown, MD 21787
    2 Zephyr Ct, Taneytown, MD 21787
    2 Zephyr Ct, Taneytown, MD 21787
    /44

    $385,000 Sold Jan 09, 2026

    2 Zephyr Ct, Taneytown, MD 21787

    • 4 Beds
    • 2 Baths
    • 1,624 Sq Ft
    • Built 1979

    Last Sold Summary

    • $237/SF
    • 115 Days On Market

    Last Listing Agent Eryn Topper NextHome Key Realty

    2 Zephyr Ct, Taneytown, MD 21787
    • 309 Taney Heights Dr, Taneytown, MD 21787
      309 Taney Heights Dr, Taneytown, MD 21787
      309 Taney Heights Dr, Taneytown, MD 21787
      /38

      Est $367,625 Not Listed For Sale

      • 4 Beds
      • 1.5 Baths
      • 1,658 Sq Ft

      309 Taney Heights Dr, Taneytown, MD 21787

      309 Taney Heights Dr, Taneytown, MD 21787
  • 11763 Harney Rd, Taneytown, MD 21787
    11763 Harney Rd, Taneytown, MD 21787
    /2

    $445,000

    • Land
    • 32.67 Acres
    • $13,621 per Acre

    11763 Harney Rd, Taneytown, MD 21787

    More pictures coming soon. Exceptional opportunity to own 32± acres of agricultural land just minutes from downtown Emmitsburg. The land features a mix of open fields and wooded areas, with gently rolling topography. Ideal for buyers seeking a private retreat, investment property, or development opportunity. Subdivision potential offers added value for future planning. Located near local

    Cathryn Campbell RE/MAX Results

    11763 Harney Rd, Taneytown, MD 21787
  • 6 Courtland St, Taneytown, MD 21787
    6 Courtland St, Taneytown, MD 21787
    6 Courtland St, Taneytown, MD 21787
    /47

    $214,000 Sold Aug 22, 2025

    6 Courtland St, Taneytown, MD 21787

    • 2 Beds
    • 1 Bath
    • 1,152 Sq Ft
    • Built 1992

    Last Sold Summary

    • $186/SF
    • 3 Days On Market

    Current Estimated Value $217,188

    Last Listing Agent Kelly Weddle J&B Real Estate

    6 Courtland St, Taneytown, MD 21787
    • 112 Morning Frost St, Taneytown, MD 21787
      112 Morning Frost St, Taneytown, MD 21787
      112 Morning Frost St, Taneytown, MD 21787
      /41

      Est $467,799 Not Listed For Sale

      • 3 Beds
      • 2.5 Baths
      • 2,871 Sq Ft

      112 Morning Frost St, Taneytown, MD 21787

      112 Morning Frost St, Taneytown, MD 21787
  • 5021 Harney Rd, Taneytown, MD 21787
    5021 Harney Rd, Taneytown, MD 21787
    5021 Harney Rd, Taneytown, MD 21787
    /57

    $580,000 Open Sat 11AM - 1PM

    • 3 Beds
    • 2.5 Baths
    • 3,740 Sq Ft

    5021 Harney Rd, Taneytown, MD 21787

    HUGE $20,000 PRICE DROP!!!A Once in-a-Lifetime Opportunity!Historic Charm Meets Modern Luxury!Welcome to a truly extraordinary property unlike anything on the market. Originally founded as a historic church, this building carries a rich story while offering a completely reimagined modern lifestyle. In 2023, the owner collaborated closely with an architect to rebuild the structure from

    Aram Baloyan Jason Mitchell Group

    5021 Harney Rd, Taneytown, MD 21787
  • 4732 Babylon Rd, Taneytown, MD 21787
    4732 Babylon Rd, Taneytown, MD 21787
    4732 Babylon Rd, Taneytown, MD 21787
    /74

    $576,200 Sold Aug 01, 2025

    4732 Babylon Rd, Taneytown, MD 21787

    • 4 Beds
    • 3 Baths
    • 2,560 Sq Ft
    • Built 1987

    Last Sold Summary

    • $225/SF
    • 2 Days On Market

    Current Estimated Value $572,654

    Last Listing Agent Patty Martin Iron Valley Real Estate of Central MD

    4732 Babylon Rd, Taneytown, MD 21787
    • 5 Tuscarora Trail, Taneytown, MD 21787
      5 Tuscarora Trail, Taneytown, MD 21787
      5 Tuscarora Trail, Taneytown, MD 21787
      /45

      Est $356,267 Not Listed For Sale

      • 3 Beds
      • 2.5 Baths
      • 1,480 Sq Ft

      5 Tuscarora Trail, Taneytown, MD 21787

      5 Tuscarora Trail, Taneytown, MD 21787
  • 19 Fairground Ave, Taneytown, MD 21787
    19 Fairground Ave, Taneytown, MD 21787
    19 Fairground Ave, Taneytown, MD 21787
    /26

    $290,000

    • 3 Beds
    • 1.5 Baths
    • 1,724 Sq Ft

    19 Fairground Ave, Taneytown, MD 21787

    Beautifully maintained and move-in ready 3BR/1.5BA semi-detached Townhome located in the quiet neighborhood of Taneytown. Pull into your private driveway and make your way to the covered front porch of your forever home. Step inside to the warm and cozy main floor offering a spacious living room, a half bath, and an open concept kitchen and dining room with chair railings and wainscoting. The

    Marc Miller VYBE Realty

    19 Fairground Ave, Taneytown, MD 21787
  • 224 Maryland Ave, Taneytown, MD 21787
    224 Maryland Ave, Taneytown, MD 21787
    224 Maryland Ave, Taneytown, MD 21787
    /37

    $400,000 Sold Jul 17, 2025

    224 Maryland Ave, Taneytown, MD 21787

    • 4 Beds
    • 3 Baths
    • 1,908 Sq Ft
    • Built 1999

    Last Sold Summary

    • $210/SF
    • 7 Days On Market

    Current Estimated Value $404,298

    Last Listing Agent Andrew Undem Berkshire Hathaway HomeServices Homesale Realty

    224 Maryland Ave, Taneytown, MD 21787
    • 833 Horseshoe Ln, Taneytown, MD 21787
      833 Horseshoe Ln, Taneytown, MD 21787
      833 Horseshoe Ln, Taneytown, MD 21787
      /39

      Est $382,098 Not Listed For Sale

      • 2 Beds
      • 3 Baths
      • 1,419 Sq Ft

      833 Horseshoe Ln, Taneytown, MD 21787

      833 Horseshoe Ln, Taneytown, MD 21787
  • 8 Hayride Ln, Taneytown, MD 21787
    8 Hayride Ln, Taneytown, MD 21787
    8 Hayride Ln, Taneytown, MD 21787
    /40

    $479,900

    • 3 Beds
    • 3 Baths
    • 2,792 Sq Ft

    8 Hayride Ln, Taneytown, MD 21787

    Welcome to this rarely offered extended James model, freshly painted and updated throughout with brand-new LVP flooring. This beautiful 3-bedroom, 3-bath home features a full walk-out basement that includes a spacious great room, a private bedroom ensuite, a hobby/craft room, and a generous storage area. The main-level great room is a standout, enhanced by a cozy gas fireplace with custom

    Chris Ciccarelli Berkshire Hathaway HomeServices Homesale Realty

    8 Hayride Ln, Taneytown, MD 21787
  • 122 Ponytail Ln, Taneytown, MD 21787
    122 Ponytail Ln, Taneytown, MD 21787
    122 Ponytail Ln, Taneytown, MD 21787
    /33

    $339,000 Sold Aug 22, 2025

    122 Ponytail Ln, Taneytown, MD 21787

    • 1 Bed
    • 2 Baths
    • 1,419 Sq Ft
    • Built 2006

    Last Sold Summary

    • $239/SF
    • 117 Days On Market

    Current Estimated Value $338,440

    Last Listing Agent Chris Ciccarelli Berkshire Hathaway HomeServices Homesale Realty

    122 Ponytail Ln, Taneytown, MD 21787
    • 73 Grand Dr, Taneytown, MD 21787
      73 Grand Dr, Taneytown, MD 21787
      73 Grand Dr, Taneytown, MD 21787
      /26

      Est $220,481 Not Listed For Sale

      • 3 Beds
      • 1.5 Baths
      • 1,032 Sq Ft

      73 Grand Dr, Taneytown, MD 21787

      73 Grand Dr, Taneytown, MD 21787
  • 7 Zephyr Ct, Taneytown, MD 21787
    7 Zephyr Ct, Taneytown, MD 21787
    7 Zephyr Ct, Taneytown, MD 21787
    /24

    $349,900 Pending

    • 4 Beds
    • 2.5 Baths
    • 1,428 Sq Ft

    7 Zephyr Ct, Taneytown, MD 21787

    Move-in ready 4 bedroom, 2.5 bath split-foyer located on a quiet cul-de-sac offering the perfect combination of comfort, convenience, and affordability. The main level features a bright, open-concept living area with a well-equipped kitchen offering ample cabinet space and stainless steel appliances. Three upstairs bedrooms include a private primary suite with a full bath, plus a shared hall bath

    Dusty Ellinger ExecuHome Realty

    7 Zephyr Ct, Taneytown, MD 21787
  • 311 E Baltimore St, Taneytown, MD 21787
    311 E Baltimore St, Taneytown, MD 21787
    311 E Baltimore St, Taneytown, MD 21787
    /42

    $335,000 Sold Apr 30, 2025

    311 E Baltimore St, Taneytown, MD 21787

    • 3 Beds
    • 1.5 Baths
    • 1,440 Sq Ft
    • Built 1884

    Last Sold Summary

    • $233/SF
    • 11 Days On Market

    Current Estimated Value $328,411

    Last Listing Agent Calley Schwaber Cummings & Co. Realtors

    311 E Baltimore St, Taneytown, MD 21787

Showing Results 81 - 120, Page 3 of 18

Maryland Carroll County Taneytown

Real Estate & Homes

How to Buy a Home How to Finance a Home How to Sell a Home

Find More Real Estate & Homes for Sale by State

Top Cities with Homes For Sale

Top Counties with Homes For Sale

More Real Estate For Sale Near Me

Disclaimer: Certain information contained herein is derived from information provided by parties other than Homes.com. All information provided is deemed reliable, but is not guaranteed to be accurate and should be independently verified.

Homes.com Licensing Information

§ 442-H New York Standard Operating Procedures

New York Fair Housing Notice

TREC: Information about brokerage services, Consumer protection notice

California DRE #01937601

Contact Homes.com Brokerage

Copyright © 2026 CoStar Group