| 20 Washington St | 810-77A-83AMC | Other, Non-Taxable Condominium Common Land | $0 | $300,000 October 27, 1980 |
| 20 Washington St 1A | 810-77B-1A | Residential Condominium | $370,400 | $265,000 November 13, 2020 |
| 20 Washington St 2A | 810-77B-2A | Residential Condominium | $291,700 | nominal ($1) September 22, 2016 |
| 20 Washington St 3A | 810-77B-3A | Residential Condominium | $345,600 | $362,121 June 30, 2023 |
| 20 Washington St 4A | 810-77B-4A | Residential Condominium | $294,600 | $197,500 December 15, 2017 |
| 20 Washington St 5A | 810-77B-5A | Residential Condominium | $292,500 | nominal ($1) November 17, 2017 |
| 20 Washington St 6A | 810-77B-6A | Residential Condominium | $304,800 | $200,000 September 16, 2016 |
| 20 Washington St 7B | 810-77B-7B | Residential Condominium | $299,600 | nominal ($1) March 4, 2024 |
| 20 Washington St 8B | 810-77B-8B | Residential Condominium | $292,500 | $112,500 September 1, 1999 |
| 20 Washington St 9B | 810-77B-9B | Residential Condominium | $289,100 | $191,250 July 18, 2016 |
| 20 Washington St 10B | 810-77B-10B | Residential Condominium | $301,700 | $210,900 June 6, 2016 |
| 20 Washington St 11C | 810-77B-11C | Residential Condominium | $359,200 | $214,000 December 12, 2006 |
| 20 Washington St 12C | 810-77B-12C | Residential Condominium | $355,900 | $250,000 December 16, 2019 |
| 20 Washington St 13C | 810-77B-13C | Residential Condominium | $289,300 | $234,000 April 23, 2019 |
| 20 Washington St 14C | 810-77B-14C | Residential Condominium | $345,900 | $335,000 September 1, 2021 |
| 20 Washington St 15C | 810-77B-15C | Residential Condominium | $292,000 | $82,500 August 19, 1996 |
| 20 Washington St 16C | 810-77B-16C | Residential Condominium | $304,800 | $160,000 October 30, 2001 |
| 20 Washington St 17D | 810-77B-17D | Residential Condominium | $304,800 | $170,000 November 13, 2014 |
| 20 Washington St 18D | 810-77B-18D | Residential Condominium | $292,000 | $234,000 June 19, 2020 |
| 20 Washington St 19D | 810-77B-19D | Residential Condominium | $289,100 | $275,000 December 31, 2021 |
| 20 Washington St 20D | 810-77B-20D | Residential Condominium | $294,200 | $96,000 November 1, 1985 |
| 20 Washington St 21D | 810-77B-21D | Residential Condominium | $292,000 | $155,000 September 22, 2017 |
| 20 Washington St 22D | 810-77B-22D | Residential Condominium | $310,300 | nominal ($1) June 28, 2004 |
| 20 Washington St 23E | 810-77B-23E | Residential Condominium | $297,700 | $176,000 May 7, 2009 |
| 20 Washington St 24E | 810-77B-24E | Residential Condominium | $293,200 | $143,000 June 29, 2011 |
| 20 Washington St 25E | 810-77B-25E | Residential Condominium | $289,100 | $405,000 September 20, 2024 |
| 20 Washington St 26E | 810-77B-26E | Residential Condominium | $301,700 | $251,250 June 21, 2019 |
| 20 Washington St 27F | 810-77B-27F | Residential Condominium | $360,600 | $138,000 February 7, 2012 |
| 20 Washington St 28F | 810-77B-28F | Residential Condominium | $318,100 | $335,000 July 15, 2022 |
| 20 Washington St 29F | 810-77B-29F | Residential Condominium | $323,100 | $104,000 May 25, 1990 |
| 20 Washington St 30F | 810-77B-30F | Residential Condominium | $392,000 | $350,000 August 20, 2021 |
| 20 Washington St 31G | 810-77B-31G | Residential Condominium | $327,700 | $233,000 October 1, 2007 |
| 20 Washington St 32G | 810-77B-32G | Residential Condominium | $313,800 | $106,233 July 26, 2019 |
| 20 Washington St 33G | 810-77B-33G | Residential Condominium | $328,300 | $225,000 May 10, 2018 |
| 20 Washington St 34G | 810-77B-34G | Residential Condominium | $355,600 | $96,000 March 31, 1999 |
| 20 Washington St 35H | 810-77B-35H | Residential Condominium | $297,700 | nominal ($1) September 1, 2017 |
| 20 Washington St 36H | 810-77B-36H | Residential Condominium | $291,700 | nominal ($1) December 29, 1997 |
| 20 Washington St 37H | 810-77B-37H | Residential Condominium | $291,700 | nominal ($100) March 2, 2022 |
| 20 Washington St 38G | 810-77B-38H | Residential Condominium | $301,700 | nominal ($1) April 14, 1994 |
| 20 Washington St 39I | 810-77B-39I | Residential Condominium | $364,700 | $155,000 February 10, 2014 |
| 20 Washington St 40I | 810-77B-40I | Residential Condominium | $295,900 | nominal ($10) February 8, 2018 |
| 20 Washington St 41I | 810-77B-41I | Residential Condominium | $343,200 | $241,000 July 31, 2019 |
| 20 Washington St 42I | 810-77B-42I | Residential Condominium | $350,100 | $253,000 July 2, 2020 |
| 20 Washington St 43I | 810-77B-43I | Residential Condominium | $292,000 | $178,000 May 20, 2010 |
| 20 Washington St 44I | 810-77B-44I | Residential Condominium | $365,700 | $219,900 June 18, 2004 |
| 20 Washington St 45J | 810-77B-45J | Residential Condominium | $364,400 | $210,000 December 9, 2003 |
| 20 Washington St 46J | 810-77B-46J | Residential Condominium | $292,000 | $340,000 December 2, 2021 |
| 20 Washington St 47J | 810-77B-47J | Residential Condominium | $348,100 | nominal ($100) June 20, 2024 |
| 20 Washington St 48J | 810-77B-48J | Residential Condominium | $290,600 | $365,000 September 29, 2022 |
| 20 Washington St 49J | 810-77B-49J | Residential Condominium | $349,700 | $81,000 June 28, 1996 |
| 20 Washington St 50J | 810-77B-50J | Residential Condominium | $366,700 | $146,000 October 25, 2011 |
| 20 Washington St 51K | 810-77B-51K | Residential Condominium | $361,000 | $245,000 August 30, 2019 |
| 20 Washington St 52K | 810-77B-52K | Residential Condominium | $345,600 | $330,000 September 1, 2021 |
| 20 Washington St 53K | 810-77B-53K | Residential Condominium | $292,000 | $75,000 July 15, 1994 |
| 20 Washington St 54K | 810-77B-54K | Residential Condominium | $294,500 | $186,000 September 2, 2005 |
| 20 Washington St 55L | 810-77B-55L | Residential Condominium | $301,700 | $215,000 April 26, 2004 |
| 20 Washington St 56L | 810-77B-56L | Residential Condominium | $315,800 | $315,000 April 14, 2023 |
| 20 Washington St 57L | 810-77B-57L | Residential Condominium | $292,000 | nominal ($1) November 9, 2011 |
| 20 Washington St 58L | 810-77B-58L | Residential Condominium | $295,200 | nominal ($100) December 20, 2024 |
| 20 Washington St 59M | 810-77B-59M | Residential Condominium | $302,800 | nominal ($1) July 25, 2014 |