AMENDMENT TO LEASE

Exhibit 10.13

AMENDMENT TO LEASE

     THIS AMENDMENT TO LEASE is made and entered into this 29^th day of January, 2001 by and between Saul Holdings, Limited Partnership, as successor to B.F. Saul Real Estate Investment Trust (hereinafter referred to as “Landlord”) and Broadsoft, Inc. (hereinafter referred to as “Tenant”),

     WHEREAS, Landlord’s predecessor and Tenant have entered into that certain Lease dated April 12, 2000 (the “Lease”) for approximately 30,000 square feet of space at 220 Perry Parkway, Gaithersburg, MD 20877; and

     WHEREAS, the parties hereto desire to enter into this Amendment to Lease for the purposes hereinafter set out.

     NOW, THEREFORE, in consideration of the premises and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto agree as follows:

     1. Pursuant to Article 57 of the Lease, Tenant has requested that Landlord contribute the Supplemental Tenant Allowance in the amount of TWO HUNDRED TEN THOUSAND AND NO/100 Dollars ($210,000.00), and Landlord has agreed to contribute the Supplemental Tenant Allowance as provided in Article 57 of the Lease.

     2. The Supplemental Tenant Allowance is to be amortized and repaid by Tenant over the remainder of the lease term with interest at the rate of twelve percent (12%).

     3. Tenant agrees to repay the Supplemental Tenant Allowance according to the terms of Article 57 of the Lease. Commencing on February 1, 2001 and on the first day of each month thereafter, through and including September 1, 2010, Tenant shall pay to Landlord, as Additional Rent pursuant to Article 57 of the Lease, the sum of THREE THOUSAND SIXTY EIGHT AND 15/100 Dollars ($3,068.15) per month beginning February 1, 2001 and ending September 1, 2010. An amortization schedule is attached hereto as Exhibit A and incorporated into this Agreement by reference.

     4. As of the date hereof, Tenant has accepted possession of the Premises “as is,” the Lease is in full force and effect in accordance with its terms, and there are no defaults thereunder on the part of either Landlord or Tenant.

     5. The effective date of this Amendment to Lease shall be February 1, 2001.

     6. Except as specifically modified hereby, the Lease shall remain in full force and effect in accordance with the terms contained therein and is hereby ratified, approved and confirmed in all respects. Any agreement, obligation or liability made, entered into or incurred by or on behalf of Landlord binds only its property and no shareholder, trustee, officer, director, employee, partner or agent of the Landlord assumes or shall be held to any liability therefor. The provisions of this Amendment to Lease shall be binding upon the parties hereto, their successors, and to the extent permitted under the Lease, their assigns.

     7. INTERPRETATION. The submission of this Amendment for examination does not constitute an agreement, an option or an offer, and this Amendment becomes effective only upon execution and delivery thereof by Landlord. Neither party shall have any legal obligation to the other in the event that the Amendment contemplated herein is not consummated for any reason. Discussions between the parties respecting the proposed Amendment described herein, shall not serve as a basis for a claim against either party or any officer, director or agent of either party. Captions and headings are for convenience and reference only and shall not in any way define, limit or describe the scope or content of any provision of this Amendment. Except as otherwise provided herein, capitalized terms shall have the same meaning as set forth in the Lease. Whenever in this Amendment (i) any printed portion, or any part thereof, has been stricken out, or (ii) any portion of the Lease (as the same may have been previously amended) or any part thereof, has been modified or stricken out, then, in either of such events, whether or not any replacement provision has been added, this Amendment and the Lease shall hereafter be read and construed as if the material so stricken out were not included, and no implication shall be drawn from the text of the material so stricken out which would be inconsistent in any way with the construction or interpretation which would be appropriate if such material had never been contained herein or in the Lease. The Exhibits referred to in this Amendment and attached hereto are a substantive part of this Amendment and are incorporated herein by reference.

     WITNESS the following signatures and seals.

ATTEST:				TENANT: BROADSOFT, INC.
/s/ Carol L. McKinney				By:		/s/ Michael Tessler
Secretary						Name:		Michael Tessler
						Title:		President and Chief Executive Officer
						Tax I.D. Number: 52 ###-###-####
ATTEST:				LANDLORD: SAUL HOLDINGS
				LIMITED PARTNERSHIP
				By: Saul Centers, Inc. General Partner
/s/ Landlord representative				By:		/s/ Philip D. Caraci				(SEAL)
Assistant Secretary						Philip D. Caraci, President

EXHIBIT A

AMORTIZATION SCHEDULE

PAGE 1 OF 3

LOAN DATA

TABLE DATA

Loan amount:

$210,000.00

Table starts at date:

02/01/2001

Annual Interest rate:

12.000%

or at payment number:

1

Term in years:

9.66

Payments per year.

12

First payment due:

02/01/2001

36817.8

PERIODIC PAYMENT

Entered payment:

The table uses the calculated periodic payment amount, unless you enter a value for “Entered payment.”

Calculated payment:

$3068.15

CALCULATIONS

Use payment of:

$3068.15

Beginning balance at payment 1:

$210,000.00

1st payment in table:

Cumulative interest prior to payment 1:

$0.00

				Payment					Beginning															Ending					Cumulative
	No.			Date					Balance					Interest					Principal					Balance					Interest
	1				02/01/2001					210,000.00					2,100.00					968.15					209,031.85					2,100.00
	2				03/01/2001					209,031.85					2,090.32					977.83					208,054.02					4190.32
	3				04/01/2001					208,054.02					2,080.54					987.61					207,066.41					6,270.86
	4				05/01/2001					207,066.41					2,070.66					997.49					206,068.92					8,341.62
	5				06/01/2001					206,068.92					2,060.69					1,007.46					205,061.46					10,402.21
	6				07/01/2001					205,061.46					2,050.61					1,017.54					204,043.92					12,452.82
	7				08/01/2001					204,043.92					2,040.44					1,027.71					203,016.21					14,493.26
	8				09/01/2001					203,016.21					2,030.16					1,037.99					201,978.22					16,523.42
	9				10/01/2001					201,978.22					2,019.78					1,048.37					200,929.85					18,543.20
	10				11/01/2001					200,929.85					2,009.30					1,058.85					199,871.00					20,552.50
	11				12/01/2001					199,871.00					1,998.71					1,069.44					198,801.56					22,551.21
	12				01/01/2002					198,801.56					1,988.02					1,080.13					197,721.43					24,539.23
	13				02/01/2002					197,721.43					1,977.21					1,090.94					196,630.49					26,516.44
	14				03/01/2002					196,630.49					1,966.30					1,101.85					195,528.64					28,482.74
	15				04/01/2002					195,528.64					1,955.29					1,112.86					194,415.78					30,438.03
	16				05/01/2002					194,415.78					1,944.16					1,123.99					193,291.79					32,382.19
	17				06/01/2002					193,291.79					1,932.92					1,135.23					192,156.56					34,315.11
	18				07/01/2002					192,156.56					1,921.57					1,146.58					191,009.98					36,236.68
	19				08/01/2002					191,009.98					1,910.10					1,158.05					189,851.93					38,146.78
	20				09/01/2002					189,851.93					1,898.52					1,169.63					188,682.30					40,045.30
	21				10/01/2002					188,682.30					1,886.82					1,181.33					187,500.97					41,932.12
	22				11/01/2002					187,500.97					1,875.01					1,193.14					186,307.83					43,807.13
	23				12/01/2002					186,307.83					1,863.08					1,205.07					185,102.76					45,670.21
	24				01/01/2003					185,102.76					1,851.03					1,217.12					183,885.64					47,521.24
	25				02/01/2003					183,885.64					1,838.86					1,229.29					182,656.35					49,360.10
	26				03/01/2003					182,656.35					1,826.56					1,241.59					181,414.76					51,186.66
	27				04/01/2003					181,414.78					1,814.15					1,254.00					180,160.76					53,000.81

EXHIBIT A

AMORTIZATION SCHEDULE

PAGE 2 OF 3

				Payment					Beginning															Ending					Cumulative
	No.			Date					Balance					Interest					Principal					Balance					Interest
	28				05/01/2003					180,160.76					1,801.61					1,266.54					178,894.22					54,802.42
	29				06/01/2003					178,894.22					1,788.94					1,279.21					177,615.01					56,591.36
	30				07/01/2003					177,615.01					1,776.15					1,292.00					176,323.01					58,367.51
	31				08/01/2003					176,323.01					1,763.23					1,304.92					175,018.09					60,130.74
	32				09/01/2003					175,018.09					1,750.18					1,317.97					173,700.12					61,880.92
	33				10/01/2003					173,700.12					1,737.00					1,331.15					172,368.97					63,617.92
	34				11/01/2003					172,368.97					1,723.69					1,344.48					171,024.51					65,341.61
	35				12/01/2003					171,024.51					1,710.25					1,357.90					169,666.61					67,051.86
	36				01/01/2004					169,666.61					1,696.67					1,371.48					168,295.13					68,748.53
	37				02/01/2004					168,295.13					1,682.95					1,385.20					166,909.93					70,431.48
	38				03/01/2004					166,909.93					1,669.10					1,399.05					165,510.88					72,100.58
	39				04/01/2004					165,510.88					1,655.11					1,413.04					164,097.84					73,755.69
	40				05/01/2004					164,097.84					1,640.98					1,427.17					162,670.87					75,396.67
	41				06/01/2004					162,670.67					1,626.71					1,441.44					161,229.23					77,023.38
	42				07/01/2004					161,229.23					1,612.29					1,455.86					159,773.37					78,635.67
	43				08/01/2004					159,773.37					1,597.73					1,470.42					158,302.95					80,233.40
	44				09/01/2004					158,302.95					1,583.03					1,485.12					156,817.83					81,816.43
	45				10/01/2004					156,817.83					1,568.18					1,499.97					155,317.86					83,384.61
	46				11/01/2004					155,317.86					1,553.18					1,514.97					153,802.89					84,937.79
	47				12/01/2004					153,802.89					1,538.03					1,530.12					152,272.77					86,475.82
	48				01/01/2005					152,272.77					1,522.73					1,545.42					150,727.35					87,998.55
	49				02/01/2005					150,727.35					1,507.27					1,580.88					149,166.47					89,505.82
	50				03/01/2005					149,166.47					1,491.66					1,576.49					147,589.98					90,997.48
	51				04/01/2005					147,589.98					1,475.90					1,592.25					145,997.73					92,473.38
	52				05/01/2005					145,997.73					1,459.98					1,608.17					144,389.66					93,933.36
	53				06/01/2005					144,389.56					1,443.90					1,624.25					142,765.31					95,377.26
	54				07/01/2005					142,765.31					1,427.65					1,640.50					141,124.81					96,804.91
	55				08/01/2005					141,124.81					1,411.25					1,656.90					139,467.91					98,216.16
	56				09/01/2005					139,467.91					1,394.68					1,673.47					137,794.44					99,610.84
	57				10/01/2005					137,794.44					1,377.94					1,690.21					136,104.23					100,988.78
	58				11/01/2005					136,104.23					1,361.04					1,707.11					134,397.12					102,349.82
	59				12/01/2005					134,397.12					1,343.97					1,724.18					132,672.94					103,693.79
	60				01/01/2006					132,672.94					1,326.73					1,741.42					130,931.52					105,020.52
	61				02/01/2006					130,931.52					1,309.32					1,758.83					129,172.69					106,329.84
	62				03/01/2006					129,172.69					1,291.73					1,776.42					127,396.27					107,621.57
	63				04/01/2006					127,396.27					1,273.96					1,794.19					125,602.09					108,895.53
	64				05/01/2006					125,602.08					1,256.02					1,812.13					123,789.95					110,151.55
	65				06/01/2006					123,789.95					1,237.90					1,830.25					121,959.70					111,389.45
	66				07/01/2006					121,959.70					1,219.60					1,848.55					120,111.15					112,609.05
	67				08/01/2006					120,111.15					1,201.11					1,867.04					118,244.11					113,810.16
	68				09/01/2006					118,244.11					1,182.44					1,885.71					116,358.40					114,992.60
	69				10/01/2006					116,358.40					1,163.58					1,904.57					114,453.83					116,156.18
	70				11/01/2006					114,453.83					1,144.54					1,923.61					112,530.22					117,300.72
	71				12/01/2005					112,530.22					1,125.30					1,942.85					110,587.37					118,426.02
	72				01/01/2007					110,587.37					1,105.87					1,962.28					108,625.09					119,531.89
	73				02/01/2007					108,625.09					1,086.25					1,981.90					106,643.19					120,618.14
	74				03/01/2007					106,643.19					1,066.43					2,001.72					104,641.47					121,684.57
	75				04/01/2007					104,641.47					1,046.41					2,021.74					102,619.73					122,730.98

EXHIBIT A

AMORTIZATION SCHEDULE

PAGE 3 OF 3

				Payment					Beginning															Ending					Cumulative
	No.			Date					Balance					Interest					Principal					Balance					Interest
	76				05/01/2007					102,619.73					1,026.20					2,041.95					100,577.78					123,757.18
	77				06/01/2007					100,577.78					1,005.78					2,062.37					98,515.41					124,762.96
	78				07/01/2007					98,515.41					985.15					2,083.00					96,432.41					125,748.11
	79				08/01/2007					96,432.41					964.32					2,103.83					94,328.58					126,712.43
	80				09/01/2007					94,328.56					943.29					2,124.86					92,203.72					127,655.72
	81				10/01/2007					92,203.72					922.04					2,146.11					90,057.61					128,577.76
	82				11/01/2007					90,057.61					900.58					2,167.57					87,890.04					129,478.34
	83				12/01/2007					87,890.04					878.90					2,189.25					85,700.79					130,357.24
	84				01/01/2008					85,700.79					857.01					2,211.14					83,489.65					131,214.25
	85				02/01/2008					83,489.65					834.90					2,233.25					81,256.40					132,049.15
	86				03/01/2008					81,258.40					812.56					2,255.59					79,000.81					132,861.71
	87				04/01/2008					79,000.81					790.01					2,278.14					76,722.67					133,651.72
	88				05/01/2008					76,722.67					767.23					2,300.92					74,421.75					134,418.95
	89				06/01/2008					74,421.75					744.22					2,323.93					72,097.32					135,163.17
	90				07/01/2008					72,097.82					720.98					2,347.17					69,750.65					135,884.15
	91				08/01/2008					69,750.65					697.51					2,370.64					67,380.01					136,581.66
	92				09/01/2008					67,380.01					673.80					2,394.35					64,985.66					137,255.46
	93				10/01/2008					64,985.66					649.86					2,418.29					62,567.37					137,905.32
	94				11/01/2008					62,567.37					625.67					2,442.48					60,124.89					138,530.99
	95				12/01/2008					60,124.89					601.25					2,466.90					57,657.99					139,132.24
	96				01/01/2009					57,657.99					576.58					2,491.57					55,166.42					139,708.82
	97				02/01/2009					55,166.42					551.66					2,516.49					52,649.93					140,260.46
	98				03/01/2009					52,649.93					526.50					2,541.65					50,108.28					140,786.98
	99				04/01/2009					50,108.28					501.08					2,567.07					47,541.21					141,288.06
	100				05/01/2009					47,541.21					475.41					2,592.74					44,948.47					141,763.47
	101				06/01/2009					44,948.47					449.48					2,618.67					42,329.80					142,212.95
	102				07/01/2009					42,329.80					423.30					2,644.85					39,684.95					142,636.25
	103				08/01/2009					39,684.95					396.85					2,671.30					37,013.65					143,033.10
	104				09/01/2009					37,013.65					370.14					2,698.01					34,315.64					143,403.24
	105				10/01/2009					34,315.64					343.16					2,724.99					31,590.65					143,746.40
	106				11/01/2009					31,590.65					315.91					2,752.24					28,838.41					144,062.31
	107				12/01/2009					28,838.41					288.38					2,779.77					26,058.64					144,350.69
	108				01/01/2010					26,058.64					260.59					2,807.56					23,251.08					144,611.28
	109				02/01/2010					23,251.08					232.51					2,835.84					20,415.44					144,843.79
	110				03/01/2010					20,415.44					204.15					2,864.00					17,551.44					145,047.94
	111				04/01/2010					17,551.44					175.51					2,892.64					14,658.80					145,223.45
	112				05/01/2010					14,658.80					146.59					2,921.56					11,737.24					145,370.04
	113				06/01/2010					11,737.24					117.37					2,950.78					8,786.46					145,487.41
	114				07/01/2010					8,786.46					87.86					2,980.29					5,806.17					145,575.27
	115				08/01/2010					5,806.17					58.06					3,010.09					2,796.05					145,633.33
	116				09/01/2010					2,796.08					27.96					2,796.08					0.00					145,661.29