2,834

Recently Sold Berkeley County WV Homes

Section Image Section Image
  • 138 Georgetown Square, Martinsburg, WV 25401
    138 Georgetown Square, Martinsburg, WV 25401
    138 Georgetown Square, Martinsburg, WV 25401
    /41

    $199,999 Sold Oct 17, 2025

    138 Georgetown Square, Martinsburg, WV 25401

    • 3 Beds
    • 2.5 Baths
    • 1,326 Sq Ft
    • Built 2000

    Last Sold Summary

    • $151/SF
    • 7 Days On Market

    Current Estimated Value $200,195

    Last Listing Agent Patrick Schneble Samson Properties

    138 Georgetown Square, Martinsburg, WV 25401
  • 2 Sleepy Creek Rd, Hedgesville, WV 25427
    2 Sleepy Creek Rd, Hedgesville, WV 25427
    2 Sleepy Creek Rd, Hedgesville, WV 25427
    /5

    $140,000 Sold Jul 18, 2025

    2 Sleepy Creek Rd, Hedgesville, WV 25427

    • Land
    • 11.31 Acres
    • $12,378 per Acre

    Last Sold Summary

    • 52 Days On Market

    Last Listing Agent Rick Boswell Gain Realty

    2 Sleepy Creek Rd, Hedgesville, WV 25427
  • 3082 Koontztown Rd, Falling Waters, WV 25419
    3082 Koontztown Rd, Falling Waters, WV 25419
    3082 Koontztown Rd, Falling Waters, WV 25419
    /17

    $252,000 Sold Apr 04, 2025

    3082 Koontztown Rd, Falling Waters, WV 25419

    • 3 Beds
    • 2 Baths
    • 1,612 Sq Ft
    • Built 1880

    Last Sold Summary

    • $156/SF
    • 1 Day On Market

    Current Estimated Value $267,340

    Last Listing Agent Gerald Minett Hallmark Realty, LLC

    3082 Koontztown Rd, Falling Waters, WV 25419
  • 64 Call Ct, Martinsburg, WV 25403
    64 Call Ct, Martinsburg, WV 25403
    64 Call Ct, Martinsburg, WV 25403
    /27

    $361,990 Sold Apr 28, 2025

    64 Call Ct, Martinsburg, WV 25403

    • 4 Beds
    • 2.5 Baths
    • 2,148 Sq Ft
    • Built 2025

    Last Sold Summary

    • $169/SF
    • 108 Days On Market

    Last Listing Agent Kathleen Cassidy D R Horton Realty of Virginia LLC

    64 Call Ct, Martinsburg, WV 25403
  • 157 Oasis Ln, Gerrardstown, WV 25420
    157 Oasis Ln, Gerrardstown, WV 25420
    157 Oasis Ln, Gerrardstown, WV 25420
    /79

    $228,600 Sold Nov 21, 2025

    157 Oasis Ln, Gerrardstown, WV 25420

    • 2 Beds
    • 2 Baths
    • 1,333 Sq Ft
    • Built 1979

    Last Sold Summary

    • $171/SF
    • 20 Days On Market

    Last Listing Agent Gregory Ahalt Hensell Realty, Co.

    157 Oasis Ln, Gerrardstown, WV 25420
  • 17 Perspective Place, Hedgesville, WV 25427
    17 Perspective Place, Hedgesville, WV 25427
    17 Perspective Place, Hedgesville, WV 25427
    /57

    $396,000 Sold Jul 03, 2025

    17 Perspective Place, Hedgesville, WV 25427

    • 3 Beds
    • 3 Baths
    • 2,408 Sq Ft
    • Built 2024

    Last Sold Summary

    • $164/SF
    • 24 Days On Market

    Last Listing Agent Patricia Sherwood Dandridge Realty Group, LLC

    17 Perspective Place, Hedgesville, WV 25427
  • 1120 Loop Rd, Gerrardstown, WV 25420
    1120 Loop Rd, Gerrardstown, WV 25420
    1120 Loop Rd, Gerrardstown, WV 25420
    /36

    $230,000 Sold Apr 30, 2025

    1120 Loop Rd, Gerrardstown, WV 25420

    • 3 Beds
    • 2 Baths
    • 1,092 Sq Ft
    • Built 1992

    Last Sold Summary

    • $211/SF
    • 63 Days On Market

    Last Listing Agent Rhonda Shade ERA Oakcrest Realty, Inc.

    1120 Loop Rd, Gerrardstown, WV 25420
  • 267 Possum Hollow Trail, Gerrardstown, WV 25420
    267 Possum Hollow Trail, Gerrardstown, WV 25420
    267 Possum Hollow Trail, Gerrardstown, WV 25420
    /41

    $217,000 Sold Feb 27, 2025

    267 Possum Hollow Trail, Gerrardstown, WV 25420

    • 2 Beds
    • 1 Bath
    • 768 Sq Ft
    • Built 1980

    Last Sold Summary

    • $283/SF
    • 5 Days On Market

    Current Estimated Value $221,789

    Last Listing Agent Carol Graves Long & Foster Real Estate, Inc.

    267 Possum Hollow Trail, Gerrardstown, WV 25420
  • 24 Cramsford St, Falling Waters, WV 25419
    24 Cramsford St, Falling Waters, WV 25419
    24 Cramsford St, Falling Waters, WV 25419
    /13

    $270,900 Sold Dec 19, 2025

    24 Cramsford St, Falling Waters, WV 25419

    • 3 Beds
    • 2.5 Baths
    • 1,443 Sq Ft
    • Built 2024

    Last Sold Summary

    • $188/SF
    • 78 Days On Market

    Last Listing Agent Martha Rose LGI Realty - West Virginia, LLC

    24 Cramsford St, Falling Waters, WV 25419
  • 17 Stork Ln, Martinsburg, WV 25405
    17 Stork Ln, Martinsburg, WV 25405
    17 Stork Ln, Martinsburg, WV 25405
    /57

    $330,000 Sold Jul 25, 2025

    17 Stork Ln, Martinsburg, WV 25405

    • 3 Beds
    • 2.5 Baths
    • 1,844 Sq Ft
    • Built 2006

    Last Sold Summary

    • $179/SF
    • 5 Days On Market

    Current Estimated Value $332,664

    Last Listing Agent Richard Conner Gain Realty

    17 Stork Ln, Martinsburg, WV 25405
  • 310 S Maple Ave, Martinsburg, WV 25401
    310 S Maple Ave, Martinsburg, WV 25401
    310 S Maple Ave, Martinsburg, WV 25401
    /37

    $174,500 Sold May 05, 2025

    310 S Maple Ave, Martinsburg, WV 25401

    • 2 Beds
    • 1.5 Baths
    • 1,092 Sq Ft
    • Built 1935

    Last Sold Summary

    • $160/SF
    • 77 Days On Market

    Current Estimated Value $166,631

    Last Listing Agent Gabe McDonald Touchstone Realty, LLC

    310 S Maple Ave, Martinsburg, WV 25401
  • HOMESITE 520 Tracy Way, Martinsburg, WV 25403

    $287,240 Sold Jul 23, 2025

    HOMESITE 520 Tracy Way, Martinsburg, WV 25403

    • 3 Beds
    • 2.5 Baths
    • 1,617 Sq Ft
    • Built 2025

    Move in Ready Sold Summary

    • $178/SF
    • 27 Days On Market

    DRB Homes Martinsburg Station - Townhomes

    HOMESITE 520 Tracy Way, Martinsburg, WV 25403
  • 386 Stayman Dr, Falling Waters, WV 25419
    386 Stayman Dr, Falling Waters, WV 25419
    386 Stayman Dr, Falling Waters, WV 25419
    /107

    $695,000 Sold May 23, 2025

    386 Stayman Dr, Falling Waters, WV 25419

    • 3 Beds
    • 4 Baths
    • 3,366 Sq Ft
    • Built 2010

    Last Sold Summary

    • $206/SF
    • 3 Days On Market

    Current Estimated Value $690,134

    Last Listing Agent Marianne Short Pearson Smith Realty, LLC

    386 Stayman Dr, Falling Waters, WV 25419
  • 116 Spur Rd, Martinsburg, WV 25404
    116 Spur Rd, Martinsburg, WV 25404
    116 Spur Rd, Martinsburg, WV 25404
    /44

    $349,990 Sold Aug 22, 2025

    116 Spur Rd, Martinsburg, WV 25404

    • 3 Beds
    • 2 Baths
    • 2,688 Sq Ft
    • Built 1991

    Last Sold Summary

    • $130/SF
    • 16 Days On Market

    Current Estimated Value $353,674

    Last Listing Agent jeff Jardine Burch Real Estate Group, LLC

    116 Spur Rd, Martinsburg, WV 25404
  • 38 Call Ct, Martinsburg, WV 25403
    38 Call Ct, Martinsburg, WV 25403
    38 Call Ct, Martinsburg, WV 25403
    /30

    $365,990 Sold Jun 24, 2025

    38 Call Ct, Martinsburg, WV 25403

    • 4 Beds
    • 2.5 Baths
    • 1,906 Sq Ft
    • Built 2025

    Last Sold Summary

    • $192/SF
    • 0 Days On Market

    Last Listing Agent Justin K Wood D.R. Horton Realty of Virginia, LLC

    38 Call Ct, Martinsburg, WV 25403
  • 70 Hatchery Rd, Inwood, WV 25428
    70 Hatchery Rd, Inwood, WV 25428
    70 Hatchery Rd, Inwood, WV 25428
    /15

    $325,000 Sold Apr 22, 2025

    70 Hatchery Rd, Inwood, WV 25428

    • Studio
    • 1,696 Sq Ft
    • Built 1930

    Last Sold Summary

    • $192/SF
    • 22 Days On Market

    Current Estimated Value $307,500

    Last Listing Agent W. Aaron Poling Black Diamond Realty, LLC

    70 Hatchery Rd, Inwood, WV 25428
  • 0 Allegheny Way Unit WVBE2034970, Gerrardstown, WV 25420
    0 Allegheny Way Unit WVBE2034970, Gerrardstown, WV 25420
    0 Allegheny Way Unit WVBE2034970, Gerrardstown, WV 25420
    /37

    $245,000 Sold Feb 21, 2025

    0 Allegheny Way Unit WVBE2034970, Gerrardstown, WV 25420

    • Land
    • 21.04 Acres
    • $11,644 per Acre

    Last Sold Summary

    • 55 Days On Market

    Last Listing Agent Drew Baggarly Whitetail Properties Real Estate, LLC

    0 Allegheny Way Unit WVBE2034970, Gerrardstown, WV 25420
  • 202 Ives St, Martinsburg, WV 25405
    202 Ives St, Martinsburg, WV 25405
    202 Ives St, Martinsburg, WV 25405
    /17

    $311,000 Sold Feb 14, 2025

    202 Ives St, Martinsburg, WV 25405

    • 3 Beds
    • 2 Baths
    • 1,197 Sq Ft
    • Built 2008

    Last Sold Summary

    • $260/SF
    • 8 Days On Market

    Current Estimated Value $313,471

    Last Listing Agent Elizabeth Nelson Long & Foster Real Estate, Inc.

    202 Ives St, Martinsburg, WV 25405
  • 143 Whitney Way, Martinsburg, WV 25401
    143 Whitney Way, Martinsburg, WV 25401
    143 Whitney Way, Martinsburg, WV 25401
    /48

    $243,000 Sold Aug 29, 2025

    143 Whitney Way, Martinsburg, WV 25401

    • 3 Beds
    • 2 Baths
    • 1,330 Sq Ft
    • Built 1900

    Last Sold Summary

    • $183/SF
    • 46 Days On Market

    Current Estimated Value $239,977

    Last Listing Agent Colleen Walters Keller Williams Realty Centre

    143 Whitney Way, Martinsburg, WV 25401
  • 155 Budding Dogwood Rd, Bunker Hill, WV 25413
    155 Budding Dogwood Rd, Bunker Hill, WV 25413
    155 Budding Dogwood Rd, Bunker Hill, WV 25413
    /5

    $142,500 Sold May 01, 2025

    155 Budding Dogwood Rd, Bunker Hill, WV 25413

    • Land
    • 5.04 Acres
    • $28,274 per Acre

    Last Sold Summary

    • 13 Days On Market

    Last Listing Agent Gabe McDonald Touchstone Realty, LLC

    155 Budding Dogwood Rd, Bunker Hill, WV 25413
  • 67 Stafford Place, Falling Waters, WV 25419
    67 Stafford Place, Falling Waters, WV 25419
    67 Stafford Place, Falling Waters, WV 25419
    /7

    $325,262 Sold Mar 27, 2025

    67 Stafford Place, Falling Waters, WV 25419

    • 3 Beds
    • 3.5 Baths
    • 2,300 Sq Ft
    • Built 2025

    Last Sold Summary

    • $141/SF

    Last Listing Agent Brittany Newman DRB Group Realty, LLC

    67 Stafford Place, Falling Waters, WV 25419
  • 404 406 S Kentucky Ave, Martinsburg, WV 25401
    404 406 S Kentucky Ave, Martinsburg, WV 25401
    404 406 S Kentucky Ave, Martinsburg, WV 25401
    /29

    $275,000 Sold Sep 05, 2025

    404 406 S Kentucky Ave, Martinsburg, WV 25401

    • Studio
    • 2,324 Sq Ft
    • Built 1920

    Last Sold Summary

    • $118/SF
    • 36 Days On Market

    Last Listing Agent Mr. Silver Silver Pearson Smith Realty, LLC

    404 406 S Kentucky Ave, Martinsburg, WV 25401
  • 74 Cramsford St, Falling Waters, WV 25419
    74 Cramsford St, Falling Waters, WV 25419
    74 Cramsford St, Falling Waters, WV 25419
    /11

    $270,900 Sold Dec 30, 2025

    74 Cramsford St, Falling Waters, WV 25419

    • 3 Beds
    • 2.5 Baths
    • 1,443 Sq Ft
    • Built 2024

    Last Sold Summary

    • $188/SF
    • 89 Days On Market

    Last Listing Agent Martha Rose LGI Realty - West Virginia, LLC

    74 Cramsford St, Falling Waters, WV 25419
  • 54 Ogunquit Dr, Martinsburg, WV 25403
    54 Ogunquit Dr, Martinsburg, WV 25403
    54 Ogunquit Dr, Martinsburg, WV 25403
    /32

    $249,900 Sold Feb 27, 2025

    54 Ogunquit Dr, Martinsburg, WV 25403

    • 3 Beds
    • 2.5 Baths
    • 1,535 Sq Ft
    • Built 2023

    Last Sold Summary

    • $163/SF
    • 4 Days On Market

    Last Listing Agent Jennifer Whitehead Coldwell Banker Premier

    54 Ogunquit Dr, Martinsburg, WV 25403
  • 236 Husky Trail, Martinsburg, WV 25403
    236 Husky Trail, Martinsburg, WV 25403
    236 Husky Trail, Martinsburg, WV 25403
    /44

    $309,990 Sold Apr 30, 2025

    236 Husky Trail, Martinsburg, WV 25403

    • 3 Beds
    • 3.5 Baths
    • 1,692 Sq Ft
    • Built 2025

    Last Sold Summary

    • $183/SF
    • 29 Days On Market

    Last Listing Agent Brittany Newman DRB Group Realty, LLC

    236 Husky Trail, Martinsburg, WV 25403
  • 440 Ludgate Manor, Falling Waters, WV 25419
    440 Ludgate Manor, Falling Waters, WV 25419
    440 Ludgate Manor, Falling Waters, WV 25419
    /36

    $382,542 Sold Apr 24, 2025

    440 Ludgate Manor, Falling Waters, WV 25419

    • 3 Beds
    • 2.5 Baths
    • 2,216 Sq Ft
    • Built 2025

    Last Sold Summary

    • $173/SF
    • 0 Days On Market

    Last Listing Agent Brittany Newman DRB Group Realty, LLC

    440 Ludgate Manor, Falling Waters, WV 25419
  • 631 Hack Wilson Way, Martinsburg, WV 25401
    631 Hack Wilson Way, Martinsburg, WV 25401
    631 Hack Wilson Way, Martinsburg, WV 25401
    /32

    $390,000 Sold Jul 07, 2025

    631 Hack Wilson Way, Martinsburg, WV 25401

    • 3 Beds
    • 2 Baths
    • 1,818 Sq Ft
    • Built 2025

    Last Sold Summary

    • $215/SF
    • 48 Days On Market

    Last Listing Agent Zach Rutherford Burch Real Estate Group, LLC

    631 Hack Wilson Way, Martinsburg, WV 25401
  • 47 Shireoaks Dr, Martinsburg, WV 25403
    47 Shireoaks Dr, Martinsburg, WV 25403
    47 Shireoaks Dr, Martinsburg, WV 25403
    /49

    $527,000 Sold May 05, 2025

    47 Shireoaks Dr, Martinsburg, WV 25403

    • 4 Beds
    • 2.5 Baths
    • 2,800 Sq Ft
    • Built 1987

    Last Sold Summary

    • $188/SF
    • 87 Days On Market

    Current Estimated Value $529,177

    Last Listing Agent Jana & Paul Klaasse Samson Properties

    47 Shireoaks Dr, Martinsburg, WV 25403
  • 195 Mossy Ln, Martinsburg, WV 25404
    195 Mossy Ln, Martinsburg, WV 25404
    195 Mossy Ln, Martinsburg, WV 25404
    /53

    $350,000 Sold Aug 25, 2025

    195 Mossy Ln, Martinsburg, WV 25404

    • 4 Beds
    • 2.5 Baths
    • 2,737 Sq Ft
    • Built 2004

    Last Sold Summary

    • $128/SF
    • 18 Days On Market

    Current Estimated Value $354,711

    Last Listing Agent Larry DeMarco Century 21 Modern Realty Results

    195 Mossy Ln, Martinsburg, WV 25404
  • 600 Husky Trail, Martinsburg, WV 25403
    600 Husky Trail, Martinsburg, WV 25403
    600 Husky Trail, Martinsburg, WV 25403
    /27

    $490,365 Sold Mar 19, 2025

    600 Husky Trail, Martinsburg, WV 25403

    • 4 Beds
    • 2.5 Baths
    • 2,478 Sq Ft
    • Built 2024

    Last Sold Summary

    • $198/SF
    • 0 Days On Market

    Last Listing Agent Brittany Newman DRB Group Realty, LLC

    600 Husky Trail, Martinsburg, WV 25403
  • 224 Husky Trail, Martinsburg, WV 25403
    224 Husky Trail, Martinsburg, WV 25403
    224 Husky Trail, Martinsburg, WV 25403
    /31

    $288,490 Sold May 23, 2025

    224 Husky Trail, Martinsburg, WV 25403

    • 3 Beds
    • 3.5 Baths
    • 1,658 Sq Ft
    • Built 2025

    Last Sold Summary

    • $174/SF
    • 64 Days On Market

    Last Listing Agent Brittany Newman DRB Group Realty, LLC

    224 Husky Trail, Martinsburg, WV 25403
  • 8 Sorento Ct, Inwood, WV 25428
    8 Sorento Ct, Inwood, WV 25428
    8 Sorento Ct, Inwood, WV 25428
    /26

    $353,990 Sold Nov 30, 2025

    8 Sorento Ct, Inwood, WV 25428

    • 4 Beds
    • 3.5 Baths
    • 2,500 Sq Ft
    • Built 2025

    Last Sold Summary

    • $142/SF
    • 26 Days On Market

    Last Listing Agent Jimmy Thomas New Home Star Virginia, LLC

    8 Sorento Ct, Inwood, WV 25428
  • 79 Milkweed Ln, Bunker Hill, WV 25413
    79 Milkweed Ln, Bunker Hill, WV 25413
    79 Milkweed Ln, Bunker Hill, WV 25413
    /17

    $355,500 Sold Sep 16, 2025

    79 Milkweed Ln, Bunker Hill, WV 25413

    • 4 Beds
    • 2.5 Baths
    • 2,022 Sq Ft
    • Built 2018

    Last Sold Summary

    • $176/SF
    • 2 Days On Market

    Current Estimated Value $357,982

    Last Listing Agent Brittany Latuch Samson Properties

    79 Milkweed Ln, Bunker Hill, WV 25413
  • 533 Sierra Dr, Martinsburg, WV 25403
    533 Sierra Dr, Martinsburg, WV 25403
    533 Sierra Dr, Martinsburg, WV 25403
    /65

    $570,000 Sold Jun 23, 2025

    533 Sierra Dr, Martinsburg, WV 25403

    • 4 Beds
    • 3.5 Baths
    • 4,294 Sq Ft
    • Built 2004

    Last Sold Summary

    • $133/SF
    • 49 Days On Market

    Current Estimated Value $569,426

    Last Listing Agent Jennifer Whitehead Coldwell Banker Premier

    533 Sierra Dr, Martinsburg, WV 25403
  • 106 1st St, Inwood, WV 25428
    106 1st St, Inwood, WV 25428
    106 1st St, Inwood, WV 25428
    /37

    $268,550 Sold Jul 16, 2025

    106 1st St, Inwood, WV 25428

    • 3 Beds
    • 2.5 Baths
    • 1,408 Sq Ft
    • Built 2004

    Last Sold Summary

    • $191/SF
    • 3 Days On Market

    Current Estimated Value $269,640

    Last Listing Agent Andrew Fultz Samson Properties

    106 1st St, Inwood, WV 25428
  • 183 Escape Ct, Hedgesville, WV 25427
    183 Escape Ct, Hedgesville, WV 25427
    183 Escape Ct, Hedgesville, WV 25427
    /25

    $430,000 Sold Mar 14, 2025

    183 Escape Ct, Hedgesville, WV 25427

    • 3 Beds
    • 2 Baths
    • 1,500 Sq Ft
    • Built 2021

    Last Sold Summary

    • $287/SF
    • 11 Days On Market

    Current Estimated Value $452,477

    Last Listing Agent Samantha Young Young & Associates

    183 Escape Ct, Hedgesville, WV 25427
  • 132 Reformation Dr, Martinsburg, WV 25405
    132 Reformation Dr, Martinsburg, WV 25405
    132 Reformation Dr, Martinsburg, WV 25405
    /24

    $386,425 Sold Oct 16, 2025

    132 Reformation Dr, Martinsburg, WV 25405

    • 5 Beds
    • 3 Baths
    • 2,486 Sq Ft
    • Built 2025

    Move in Ready Sold Summary

    • $155/SF
    • 17 Days On Market

    K. Hovnanian Homes Ascend at Liberty Run

    132 Reformation Dr, Martinsburg, WV 25405
  • 396 Dorothy Ct, Inwood, WV 25428
    396 Dorothy Ct, Inwood, WV 25428
    396 Dorothy Ct, Inwood, WV 25428
    /22

    $229,000 Sold Jun 16, 2025

    396 Dorothy Ct, Inwood, WV 25428

    • 3 Beds
    • 2 Baths
    • 1,280 Sq Ft
    • Built 2014

    Last Sold Summary

    • $179/SF
    • 4 Days On Market

    Current Estimated Value $232,084

    Last Listing Agent Larry DeMarco Century 21 Modern Realty Results

    396 Dorothy Ct, Inwood, WV 25428
  • 329 N High St, Martinsburg, WV 25404
    329 N High St, Martinsburg, WV 25404
    329 N High St, Martinsburg, WV 25404
    /21

    $243,000 Sold Oct 31, 2025

    329 N High St, Martinsburg, WV 25404

    • 3 Beds
    • 2 Baths
    • 1,860 Sq Ft
    • Built 1910

    Last Sold Summary

    • $131/SF
    • 29 Days On Market

    Current Estimated Value $221,992

    Last Listing Agent Sonja Bushue Samson Properties

    329 N High St, Martinsburg, WV 25404
  • 353 Fontana Cir, Martinsburg, WV 25403
    353 Fontana Cir, Martinsburg, WV 25403
    353 Fontana Cir, Martinsburg, WV 25403
    /45

    $399,900 Sold Apr 04, 2025

    353 Fontana Cir, Martinsburg, WV 25403

    • 4 Beds
    • 2.5 Baths
    • 2,420 Sq Ft
    • Built 2010

    Last Sold Summary

    • $165/SF
    • 3 Days On Market

    Current Estimated Value $398,189

    Last Listing Agent Stuart Sinclair Coldwell Banker Premier

    353 Fontana Cir, Martinsburg, WV 25403

Showing Results 641 - 680, Page 17 of 18

West Virginia Berkeley County

Recently Sold Real Estate & Homes in Berkeley County, WV

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

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