181

Recently Sold Jefferson County IA Homes

Section Image
  • 1013 Grand Park Dr, Fairfield, IA 52556
    1013 Grand Park Dr, Fairfield, IA 52556
    1013 Grand Park Dr, Fairfield, IA 52556
    /28

    $137,000 Sold Mar 26, 2025

    1013 Grand Park Dr, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 875 Sq Ft
    • Built 1972

    Last Sold Summary

    • 14% Below List Price
    • $157/SF
    • 152 Days On Market

    Current Estimated Value $145,042

    Last Listing Agent Joanne Terrien Village Realty

    1013 Grand Park Dr, Fairfield, IA 52556
  • 504 S D St, Fairfield, IA 52556
    504 S D St, Fairfield, IA 52556
    504 S D St, Fairfield, IA 52556
    /31

    $149,000 Sold Sep 16, 2025

    504 S D St, Fairfield, IA 52556

    • 3 Beds
    • 1 Bath
    • 1,168 Sq Ft
    • Built 1953

    Last Sold Summary

    • $128/SF
    • 1 Day On Market

    Current Estimated Value $152,871

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    504 S D St, Fairfield, IA 52556
  • 2672 Douds Rd, Libertyville, IA 52567
    2672 Douds Rd, Libertyville, IA 52567
    2672 Douds Rd, Libertyville, IA 52567
    /47

    $275,000 Sold Nov 06, 2025

    2672 Douds Rd, Libertyville, IA 52567

    • Land
    • 0 Acre

    Last Sold Summary

    • 21% Below List Price
    • 4 Days On Market

    Last Listing Agent Jim Davis Iowa Land Company

    2672 Douds Rd, Libertyville, IA 52567
  • 1103 S 4th St, Fairfield, IA 52556
    1103 S 4th St, Fairfield, IA 52556
    1103 S 4th St, Fairfield, IA 52556
    /16

    $125,000 Sold Oct 23, 2025

    1103 S 4th St, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,368 Sq Ft
    • Built 1953

    Last Sold Summary

    • 20% Below List Price
    • $91/SF
    • 156 Days On Market

    Current Estimated Value $128,031

    Last Listing Agent Lisa Murguia Fairfield Real Estate

    1103 S 4th St, Fairfield, IA 52556
  • 1221 Glenview Cir, Fairfield, IA 52556
    1221 Glenview Cir, Fairfield, IA 52556
    1221 Glenview Cir, Fairfield, IA 52556
    /60

    $360,000 Sold Aug 22, 2025

    1221 Glenview Cir, Fairfield, IA 52556

    • 4 Beds
    • 3 Baths
    • 2,681 Sq Ft
    • Built 1969

    Last Sold Summary

    • 9% Below List Price
    • $134/SF
    • 12 Days On Market

    Current Estimated Value $361,336

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    1221 Glenview Cir, Fairfield, IA 52556
  • 505 S B St, Fairfield, IA 52556
    505 S B St, Fairfield, IA 52556
    505 S B St, Fairfield, IA 52556
    /19

    $248,000 Sold Feb 23, 2025

    505 S B St, Fairfield, IA 52556

    • 5 Beds
    • 2.5 Baths
    • 1,407 Sq Ft
    • Built 1983

    Last Sold Summary

    • 3% Below List Price
    • $176/SF
    • 43 Days On Market

    Current Estimated Value $253,540

    Last Listing Agent Charity Richardson Miller Realty

    505 S B St, Fairfield, IA 52556
  • 1947 Willow Blvd, Lockridge, IA 52635
    1947 Willow Blvd, Lockridge, IA 52635
    1947 Willow Blvd, Lockridge, IA 52635
    /58

    $165,000 Sold Oct 13, 2025

    1947 Willow Blvd, Lockridge, IA 52635

    • 2 Beds
    • 2 Baths
    • 1,336 Sq Ft
    • Built 1981

    Last Sold Summary

    • $124/SF
    • 63 Days On Market

    Current Estimated Value $166,738

    Last Listing Agent Angelina Porter Rock Creek Real Estate, LLC

    1947 Willow Blvd, Lockridge, IA 52635
  • 113 Washington St, Libertyville, IA 52567
    113 Washington St, Libertyville, IA 52567
    113 Washington St, Libertyville, IA 52567
    /30

    $220,000 Sold Nov 21, 2025

    113 Washington St, Libertyville, IA 52567

    • 4 Beds
    • 3 Baths
    • 1,944 Sq Ft
    • Built 1976

    Last Sold Summary

    • 10% Below List Price
    • $113/SF
    • 58 Days On Market

    Last Listing Agent Jennifer Stever Miller Realty

    113 Washington St, Libertyville, IA 52567
  • 2006 Radiance Cir, Fairfield, IA 52556
    2006 Radiance Cir, Fairfield, IA 52556
    2006 Radiance Cir, Fairfield, IA 52556
    /18

    $175,000 Sold May 30, 2025

    2006 Radiance Cir, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 2,738 Sq Ft
    • Built 2003

    Last Sold Summary

    • 24% Below List Price
    • $64/SF
    • 9 Days On Market

    Current Estimated Value $286,103

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    2006 Radiance Cir, Fairfield, IA 52556
  • 1445 Ginkgo Ave, Packwood, IA 52580
    1445 Ginkgo Ave, Packwood, IA 52580
    1445 Ginkgo Ave, Packwood, IA 52580
    /65

    $2,238,375 Sold Mar 31, 2025

    1445 Ginkgo Ave, Packwood, IA 52580

    • 4 Beds
    • Built 1900

    Last Sold Summary

    • 223,837,400% Above List Price
    • 31 Days On Market

    Current Estimated Value $768,864

    Last Listing Agent Michael Goehring Greiner Real Estate & Auction

    1445 Ginkgo Ave, Packwood, IA 52580
  • 1007 W Stone Ave, Fairfield, IA 52556
    1007 W Stone Ave, Fairfield, IA 52556
    1007 W Stone Ave, Fairfield, IA 52556
    /24

    $100,000 Sold Dec 23, 2025

    1007 W Stone Ave, Fairfield, IA 52556

    • 2 Beds
    • 1 Bath
    • 806 Sq Ft
    • Built 1920

    Last Sold Summary

    • $124/SF
    • 8 Days On Market

    Last Listing Agent Wayne Ades Epique Realty

    1007 W Stone Ave, Fairfield, IA 52556
  • 300 E Buchanan Ave, Fairfield, IA 52556
    300 E Buchanan Ave, Fairfield, IA 52556
    300 E Buchanan Ave, Fairfield, IA 52556
    /11

    $227,500 Sold Aug 26, 2025

    300 E Buchanan Ave, Fairfield, IA 52556

    • 3,696 Sq Ft
    • Built 1993

    Last Sold Summary

    • 1% Above List Price
    • $62/SF
    • 5 Days On Market

    Current Estimated Value $152,000

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    300 E Buchanan Ave, Fairfield, IA 52556
  • 104 E Maple Ave, Libertyville, IA 52567
    104 E Maple Ave, Libertyville, IA 52567
    104 E Maple Ave, Libertyville, IA 52567
    /27

    $105,800 Sold May 09, 2025

    104 E Maple Ave, Libertyville, IA 52567

    • 2 Beds
    • 2 Baths
    • 2,048 Sq Ft
    • Built 1900

    Last Sold Summary

    • 10% Below List Price
    • $52/SF
    • 175 Days On Market

    Current Estimated Value $111,724

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    104 E Maple Ave, Libertyville, IA 52567
  • 601 W Carpenter Ave, Fairfield, IA 52556
    601 W Carpenter Ave, Fairfield, IA 52556
    601 W Carpenter Ave, Fairfield, IA 52556
    /28

    $162,500 Sold Jun 20, 2025

    601 W Carpenter Ave, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,284 Sq Ft
    • Built 1955

    Last Sold Summary

    • $127/SF
    • 9 Days On Market

    Current Estimated Value $159,401

    Last Listing Agent Loren Town Fairfield Real Estate

    601 W Carpenter Ave, Fairfield, IA 52556
  • 703 W Briggs Ave, Fairfield, IA 52556
    703 W Briggs Ave, Fairfield, IA 52556
    703 W Briggs Ave, Fairfield, IA 52556
    /15

    $100,000 Sold Jun 13, 2025

    703 W Briggs Ave, Fairfield, IA 52556

    • 1,148 Sq Ft
    • Built 1890

    Last Sold Summary

    • 13% Below List Price
    • $87/SF
    • 112 Days On Market

    Last Listing Agent Douglas Alexander Fairfield Real Estate

    703 W Briggs Ave, Fairfield, IA 52556
  • 309 E Kirkwood Ave, Fairfield, IA 52556
    309 E Kirkwood Ave, Fairfield, IA 52556
    309 E Kirkwood Ave, Fairfield, IA 52556
    /52

    $187,000 Sold Nov 03, 2025

    309 E Kirkwood Ave, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,788 Sq Ft
    • Built 1880

    Last Sold Summary

    • 1% Below List Price
    • $105/SF
    • 35 Days On Market

    Current Estimated Value $181,753

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    309 E Kirkwood Ave, Fairfield, IA 52556
  • 2159 S 32nd St, Fairfield, IA 52556
    2159 S 32nd St, Fairfield, IA 52556
    2159 S 32nd St, Fairfield, IA 52556
    /34

    $445,000 Sold Sep 12, 2025

    2159 S 32nd St, Fairfield, IA 52556

    • Land
    • 9.11 Acres
    • $48,847 per Acre

    Last Sold Summary

    • 5% Below List Price
    • 80 Days On Market

    Current Estimated Value $438,232

    Last Listing Agent Kristin Miller Miller Realty

    2159 S 32nd St, Fairfield, IA 52556
  • 403 S Court St, Fairfield, IA 52556
    403 S Court St, Fairfield, IA 52556
    /2

    $150,000 Sold Sep 05, 2025

    403 S Court St, Fairfield, IA 52556

    • 1,536 Sq Ft
    • Built 1978

    Last Sold Summary

    • 6% Below List Price
    • $98/SF

    Current Estimated Value $169,033

    Last Listing Agent Lisa Cohen Village Realty

    403 S Court St, Fairfield, IA 52556
  • 304 W Adams Ave, Fairfield, IA 52556
    304 W Adams Ave, Fairfield, IA 52556
    304 W Adams Ave, Fairfield, IA 52556
    /40

    $141,500 Sold Dec 15, 2025

    304 W Adams Ave, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,388 Sq Ft
    • Built 1900

    Last Sold Summary

    • 2% Above List Price
    • $102/SF
    • 1 Day On Market

    Last Listing Agent Beth Alonso Fairfield Real Estate

    304 W Adams Ave, Fairfield, IA 52556
  • 404 Washington St, Libertyville, IA 52567
    404 Washington St, Libertyville, IA 52567
    404 Washington St, Libertyville, IA 52567
    /39

    $149,900 Sold Jun 04, 2025

    404 Washington St, Libertyville, IA 52567

    • 3 Beds
    • 2 Baths
    • 1,782 Sq Ft
    • Built 2000

    Last Sold Summary

    • $84/SF
    • 5 Days On Market

    Current Estimated Value $148,269

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    404 Washington St, Libertyville, IA 52567
  • 805 W Depot Ave, Fairfield, IA 52556
    805 W Depot Ave, Fairfield, IA 52556
    805 W Depot Ave, Fairfield, IA 52556
    /33

    $128,000 Sold Oct 10, 2025

    805 W Depot Ave, Fairfield, IA 52556

    • 1,829 Sq Ft
    • Built 1900

    Last Sold Summary

    • 8% Below List Price
    • $70/SF
    • 11 Days On Market

    Current Estimated Value $129,824

    Last Listing Agent Michaela Mclain Village Realty

    805 W Depot Ave, Fairfield, IA 52556
  • 403 E Pierce Ave, Fairfield, IA 52556
    403 E Pierce Ave, Fairfield, IA 52556
    403 E Pierce Ave, Fairfield, IA 52556
    /28

    $230,500 Sold Sep 04, 2025

    403 E Pierce Ave, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,896 Sq Ft
    • Built 1962

    Last Sold Summary

    • 1% Below List Price
    • $122/SF
    • 5 Days On Market

    Current Estimated Value $231,294

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    403 E Pierce Ave, Fairfield, IA 52556
  • 614 W Jackson Ave, Fairfield, IA 52556
    614 W Jackson Ave, Fairfield, IA 52556
    614 W Jackson Ave, Fairfield, IA 52556
    /16

    $75,000 Sold Jun 23, 2025

    614 W Jackson Ave, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 980 Sq Ft
    • Built 1919

    Last Sold Summary

    • 12% Below List Price
    • $77/SF
    • 5 Days On Market

    Current Estimated Value $90,486

    Last Listing Agent Joanne Terrien Village Realty

    614 W Jackson Ave, Fairfield, IA 52556
  • 1703 Linden Dr, Fairfield, IA 52556
    1703 Linden Dr, Fairfield, IA 52556
    1703 Linden Dr, Fairfield, IA 52556
    /20

    $190,000 Sold Oct 06, 2025

    1703 Linden Dr, Fairfield, IA 52556

    • 2 Beds
    • 2 Baths
    • 1,062 Sq Ft
    • Built 1998

    Last Sold Summary

    • 3% Below List Price
    • $179/SF
    • 4 Days On Market

    Last Listing Agent Terri Kness Davis & Palmer Real Estate

    1703 Linden Dr, Fairfield, IA 52556
  • 407 W Hempstead Ave, Fairfield, IA 52556
    407 W Hempstead Ave, Fairfield, IA 52556
    407 W Hempstead Ave, Fairfield, IA 52556
    /19

    $145,000 Sold Aug 22, 2025

    407 W Hempstead Ave, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,522 Sq Ft
    • Built 1900

    Last Sold Summary

    • 12% Below List Price
    • $95/SF
    • 250 Days On Market

    Current Estimated Value $150,273

    Last Listing Agent Jennifer Stever Miller Realty

    407 W Hempstead Ave, Fairfield, IA 52556
  • 304 W Kirkwood Ave Unit 10, Fairfield, IA 52556
    304 W Kirkwood Ave Unit 10, Fairfield, IA 52556
    304 W Kirkwood Ave Unit 10, Fairfield, IA 52556
    /18

    $60,000 Sold Feb 26, 2025

    304 W Kirkwood Ave Unit 10, Fairfield, IA 52556

    • 2 Beds
    • 1 Bath
    • 800 Sq Ft
    • Built 1976

    Last Sold Summary

    • 14% Below List Price
    • $75/SF
    • 226 Days On Market

    Current Estimated Value $66,831

    Last Listing Agent Joanne Terrien Village Realty

    304 W Kirkwood Ave Unit 10, Fairfield, IA 52556
  • 1015 Grand Park Dr, Fairfield, IA 52556
    1015 Grand Park Dr, Fairfield, IA 52556
    1015 Grand Park Dr, Fairfield, IA 52556
    /24

    $159,000 Sold Feb 24, 2025

    1015 Grand Park Dr, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,024 Sq Ft
    • Built 1975

    Last Sold Summary

    • 8% Below List Price
    • $155/SF
    • 109 Days On Market

    Current Estimated Value $168,845

    Last Listing Agent Tammy Thomas LIV Real Estate & Property Management

    1015 Grand Park Dr, Fairfield, IA 52556
  • 206 N 5th St, Fairfield, IA 52556
    206 N 5th St, Fairfield, IA 52556
    /2

    $160,000 Sold Mar 31, 2025

    206 N 5th St, Fairfield, IA 52556

    • 7 Baths
    • 2,005 Sq Ft
    • Built 1880

    Last Sold Summary

    • $80/SF
    • 1 Day On Market

    Current Estimated Value $173,092

    Last Listing Agent Andrew Edlin Miller Realty

    206 N 5th St, Fairfield, IA 52556
  • 604 S 4th St, Fairfield, IA 52556
    604 S 4th St, Fairfield, IA 52556
    604 S 4th St, Fairfield, IA 52556
    /29

    $190,000 Sold May 23, 2025

    604 S 4th St, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,469 Sq Ft
    • Built 1923

    Last Sold Summary

    • 3% Below List Price
    • $129/SF
    • 61 Days On Market

    Current Estimated Value $183,743

    Last Listing Agent Colton Burnett Miller Realty

    604 S 4th St, Fairfield, IA 52556
  • 504 Fairway Place, Fairfield, IA 52556
    504 Fairway Place, Fairfield, IA 52556
    504 Fairway Place, Fairfield, IA 52556
    /62

    $450,000 Sold Feb 20, 2025

    504 Fairway Place, Fairfield, IA 52556

    • 4 Beds
    • 4 Baths
    • 3,939 Sq Ft
    • Built 1965

    Last Sold Summary

    • 17% Below List Price
    • $114/SF
    • 562 Days On Market

    Current Estimated Value $493,941

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    504 Fairway Place, Fairfield, IA 52556
  • 1449 Colombine Blvd, Packwood, IA 52580
    1449 Colombine Blvd, Packwood, IA 52580
    1449 Colombine Blvd, Packwood, IA 52580
    /28

    $551,000 Sold May 29, 2025

    1449 Colombine Blvd, Packwood, IA 52580

    • Land
    • 23.95 Acres
    • $23,006 per Acre

    Last Sold Summary

    • 4% Above List Price
    • 4 Days On Market

    Current Estimated Value $549,514

    Last Listing Agent Aaron Creger Midwest Land Group LLC

    1449 Colombine Blvd, Packwood, IA 52580
  • 909 E Hempstead Ave, Fairfield, IA 52556
    909 E Hempstead Ave, Fairfield, IA 52556
    909 E Hempstead Ave, Fairfield, IA 52556
    /63

    $299,000 Sold Oct 17, 2025

    909 E Hempstead Ave, Fairfield, IA 52556

    • 2 Beds
    • 4 Baths
    • 2,499 Sq Ft
    • Built 1976

    Last Sold Summary

    • 3% Below List Price
    • $120/SF
    • 10 Days On Market

    Current Estimated Value $300,370

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    909 E Hempstead Ave, Fairfield, IA 52556
  • 1110 S 5th St, Fairfield, IA 52556
    1110 S 5th St, Fairfield, IA 52556
    1110 S 5th St, Fairfield, IA 52556
    /35

    $127,000 Sold Aug 29, 2025

    1110 S 5th St, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,082 Sq Ft
    • Built 1920

    Last Sold Summary

    • 2% Below List Price
    • $117/SF
    • 59 Days On Market

    Current Estimated Value $126,867

    Last Listing Agent Michaela Mclain Village Realty

    1110 S 5th St, Fairfield, IA 52556
  • 2102 Sapphire Ln, Fairfield, IA 52556
    2102 Sapphire Ln, Fairfield, IA 52556
    2102 Sapphire Ln, Fairfield, IA 52556
    /29

    $177,500 Sold Dec 29, 2025

    2102 Sapphire Ln, Fairfield, IA 52556

    • 2 Beds
    • 2 Baths
    • 1,292 Sq Ft
    • Built 2017

    Last Sold Summary

    • $137/SF
    • 3 Days On Market

    Last Listing Agent Loren Town Fairfield Real Estate

    2102 Sapphire Ln, Fairfield, IA 52556
  • 409 S 17th St, Fairfield, IA 52556
    409 S 17th St, Fairfield, IA 52556
    409 S 17th St, Fairfield, IA 52556
    /28

    $150,000 Sold May 30, 2025

    409 S 17th St, Fairfield, IA 52556

    • 3 Beds
    • 1 Bath
    • 1,320 Sq Ft
    • Built 1900

    Last Sold Summary

    • 12% Below List Price
    • $114/SF
    • 240 Days On Market

    Current Estimated Value $154,051

    Last Listing Agent Samantha Westercamp Meadow and Main Inc.

    409 S 17th St, Fairfield, IA 52556
  • 1239 Pleasant Plain Rd, Brighton, IA 52540
    1239 Pleasant Plain Rd, Brighton, IA 52540
    1239 Pleasant Plain Rd, Brighton, IA 52540
    /32

    $340,000 Sold Jan 30, 2026

    1239 Pleasant Plain Rd, Brighton, IA 52540

    • Land
    • 4.76 Acres
    • $71,429 per Acre

    Last Sold Summary

    • 9% Below List Price
    • 151 Days On Market

    Last Listing Agent Jennifer Stever Miller Realty

    1239 Pleasant Plain Rd, Brighton, IA 52540
  • 2569 Iowa 1, Fairfield, IA 52556
    2569 Iowa 1, Fairfield, IA 52556
    2569 Iowa 1, Fairfield, IA 52556
    /50

    $225,000 Sold Sep 30, 2025

    2569 Iowa 1, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,884 Sq Ft
    • Built 1954

    Last Sold Summary

    • 7% Below List Price
    • $119/SF
    • 2 Days On Market

    Last Listing Agent Ben Harshyne Whitetail Properties Real Estate, LLC

    2569 Iowa 1, Fairfield, IA 52556
  • 716 W Taylor Ave, Fairfield, IA 52556
    716 W Taylor Ave, Fairfield, IA 52556
    716 W Taylor Ave, Fairfield, IA 52556
    /23

    $120,108 Sold Feb 18, 2025

    716 W Taylor Ave, Fairfield, IA 52556

    • 3 Beds
    • 2 Baths
    • 1,122 Sq Ft
    • Built 1961

    Last Sold Summary

    • 23% Below List Price
    • $107/SF
    • 160 Days On Market

    Last Listing Agent Tammy Dunbar Fairfield Real Estate

    716 W Taylor Ave, Fairfield, IA 52556
  • 1080 & 1084 Linby Dr, Packwood, IA 52580
    1080 & 1084 Linby Dr, Packwood, IA 52580
    1080 & 1084 Linby Dr, Packwood, IA 52580
    /15

    $240,000 Sold Aug 07, 2025

    1080 & 1084 Linby Dr, Packwood, IA 52580

    • 3 Beds
    • 2 Baths
    • 1,530 Sq Ft
    • Built 1900

    Last Sold Summary

    • 4% Below List Price
    • $157/SF
    • 91 Days On Market

    Last Listing Agent Greg Millikin RE/MAX @ the Depot

    1080 & 1084 Linby Dr, Packwood, IA 52580
  • 0 Jasmine Ave Unit 6324776, Fairfield, IA 52556
    0 Jasmine Ave Unit 6324776, Fairfield, IA 52556
    /2

    $300,000 Sold Mar 31, 2025

    0 Jasmine Ave Unit 6324776, Fairfield, IA 52556

    Last Sold Summary

    • 4% Below List Price
    • 4 Days On Market

    Last Listing Agent James Horras Fairfield Real Estate

    0 Jasmine Ave Unit 6324776, Fairfield, IA 52556

Showing Results 41 - 80, Page 2 of 5

Iowa Jefferson County

Recently Sold Real Estate & Homes in Jefferson County, IA

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