Lease Agreement between VASAKRONAN AB (PUBLIC LIMITED COMPANY) and SIRF TECHNOLOGY AB regarding premises in

Exhibit 10.15

Lease Agreement

between

VASAKRONAN AB (PUBLIC LIMITED COMPANY)

and

SIRF TECHNOLOGY AB

regarding premises in

Stockholm Block Beridarebanan 11

Lease Agreement Forms

Appendix 1 Index Clause

Appendix 2 Property Clause

Appendix 3 Special Regulations

Appendix 4 Plans

Information

Note that an appendix is at times required in addition to the X in the check box for the agreement in the appendix to be valid. This is concerns for example regarding the Index Clause, Property Tax Clause and the Lessees right to rent reduction when customary maintenance is done.

Also consult Instructions drawn up by the organizations.

Information

Note that an appendix is at times required in addition to the X in the check box for the agreement in the appendix to be valid. This is concerns for example regarding the Index Clause, Property Tax Clause and the Lessees right to rent reduction when customary maintenance is done.

Also consult Instructions drawn up by the organizations.

Information

Note that an appendix is at times required in addition to the X in the check box for the agreement in the appendix to be valid. This is concerns for example regarding the Index Clause, Property Tax Clause and the Lessees right to rent reduction when customary maintenance is done.

Also consult Instructions drawn up by the organizations.

Information

Note that an appendix is at times required in addition to the X in the check box for the agreement in the appendix to be valid. This is concerns for example regarding the Index Clause, Property Tax Clause and the Lessees right to rent reduction when customary maintenance is done.

Also consult Instructions drawn up by the organizations.

Swedish Property Federation. Form no. 12 B, prepared in 1998 consultation with the Swedish Federation of

Trade and the Swedish Hotels- and Restaurants

Association. Copying prohibited. License Number ###-###-####-092406 Ver. No. 6.01 Registered to: Vasakronan AB

[Signature]

Appendix No. 1

Swedish Property Federation. Form no. 6E, prepared in 1999 in consultation with the Swedish Federation of Trade and the Swedish Hotels- and Restaurants Association (SHR). The examples in the instructions were revised in May 2002. Copying prohibited.

License number: 914863766-092406. Ver. no: 6.01. Registered to: Vasakronan AB.

[Initials]

Page 2 (2)

Instructions in respect of Index Clause for premises

Base Rent

Whether all or a part of the rent stipulated in the Lease Agreement shall constitute the base rent, is a subject to negotiation, and can depend on the terms of the Lease Agreement (such as for example the rent amount expressed as SEK/m² per year and what other obligations the Lessee is responsible for, etc.).

Base Figure

The index level for the month of October that the base rent is deemed to be aligned to constitutes the base figure, unless otherwise agreed by designating a year (as per conditions stated on page 1).

Comparison of index levels shall be done as soon as the annual October index is published. During recent years the October index has been published by the middle of November.

Calculation of the surcharge

Example

Calculation of the surcharge for 2002

Presume that the base rent is SEK 100,000 per year and is aligned to the consumer price index for October 1999, which is 259.7 (the base figure). The October index for 2001 is 269.1.

Alternative A: Assume that the consumer price index for October 2001 instead had been lower than the year before, for example 262.0 (the index for October 2000 was 262.6).

The Difference between the assumed index level 262.0 and the base figure 259.7 would still be positive and amount to 2.3. The quotient between 2.3 and the base figure 259.7, multiplied by the base rent would have amounted to a surcharge of SEK 885.63. The total rent would however have been lower than for 2001.

Alternative B: Assume that the consumer price index for October 2001 had instead been lower than the base figure 259.7, for example 259.5.

The difference between 259.5 and the base figure 259.7 would then have been negative. No surcharge would apply. The rent stated in the Lease Agreement would apply.

[Initials]

Swedish Property Federation.

Form no. 7B, prepared in 1995. Item 2 in the Instructions was revised in 1997. Copying prohibited.

License number: 914863766. Ver. no: 6.01. Registered to: Vasakronan AB.

[Initials]

Page 2 (2)

INSTRUCTIONS

1.

The Clause was formulated in June 1995, i.e. before the time (normally January 1 1996) that the property tax for premises takes effect. The clause therefore has a wording that makes it possible to add it to agreements signed before tax is payable, as well as agreements that are signed when taxes are in fact payable.

2.

The compensation shall pay for increased management costs irrespective of who in reality is liable to tax. The Property Owner/Lessor is liable to tax. If the Property Owner/Lessor is a trading company the Partners were liable to tax, according to earlier regulations. But the surcharges were nevertheless payable to the Lessor. After January 1 1997 it is however the Trading Company that is liable to the property tax.

3.

According to 19§ of the Leasing Law the rent amount –hall – with a few exceptions - be determined in the Lease Agreement. If the leasing term of the Lease is determined and at least three years, further reservations, indicating that the rent shall be payable with an amount that is determined according to “other grounds for calculation”, for example index regulation, apply. This also means that the term of the Lease must be determined and at least three years for the Lessor to be able to take compensation for property tax with an amount that may vary as the tax changes. Furthermore the grounds for calculation must be indicated in the Agreement. A condition for clause is therefore that the Parties indicate how big a share of the tax the Lessee shall compensate the Lessor for.

According to the regulations in force at the time of the preparation of this clause, the tax consists of a certain percentage of the tax value of premises (both land and buildings). The information can be found in the annual tax information. The Lessee’s share of the tax for the premises can be determined as the ratio between the rent of the Lessee and the total rent amount of the property.

The calculation method chosen by the Parties becomes a matter of negotiation. Also other bases of calculation can be used. To simplify the Lessee’s share should remain unchanged throughout the term of the Lease and thus independent of among other how the tax might come to be calculated in the future as well as changes of the leasing market.

It is advisable to indicate how the share of the premises has been calculated in therefore intended place. If this information were not to be interred, it shall nevertheless not mean that the agreement becomes invalid. There might exist different buildings with different value yeas and different types of tax units (small house unit, apartment building unit, industrial unit and special unit) on one property. The tax – for which the Lessee shall pay compensation – shall only pertain to the building where the premises are contained. Building normally refers to independent structure. The required data can be found in the information on decision regarding general property tax that the taxation authorities have handed over to the property owner. A property owner, who has problems calculating the share of the Lessee, should contact his property federation for assistance.

Enter the share of the Lessee!

4.

The clause contains two alternatives. In the first alternative the compensation for the tax is payable as a surcharge “beside” the rent indicated in the Agreement. If the tax disappears, the surcharge disappears automatically. The second alternative requires the Parties to agree on a certain rent wherein among other the compensation for the tax applicable at the time. The Lessee shall nevertheless pay for the increased expenses if the tax were to increase, regardless of the reason (for example increased tax rate, increased tax value etc.). If the tax were to disappear, the rent returns to its original amount, i.e. the rent agreed upon (which includes compensation for the tax that was applicable at the beginning, and has now ceased). Naturally the Lessee shall continue to pay other existing surcharges, such as for index changes, changes in heating costs, etc.

5.

To the extent that the Lessee has to pay surcharges for property tax, the surcharge should be shown separately on the rent notice.

6.

Mark the chosen alternative with an X. The Lessee’s share as well the applicable amount is indicated in the chosen alternative. Also indicate how the Lessee’s share has been calculated.

[Signature]

Lease Agreement – Appendix 3

ADDENDUM TO LEASE AGREEMENT

SPECIAL REGULATIONS

Undersigned have this day agreed upon the following addendum to Lease Agreement No A0139003-311332

The Lessee does not have the right to transfer his rights and obligations in this Lease Agreement, without the written permission from the Lessor. Transfer in this paragraph equals transfer of owner majority or the authority over the Lessee company.

Furthermore, the Lessee does not have the right to, in full or in part, sublet the premises, or to change the business without each time, beforehand, obtaining the written permission from the Lessor.

The Lessee agrees to observe the prohibition to load and unload goods at the street level. Arrangements for delivery of goods are put in place through traffic routes and loading garage spots in the uppermost basement of the building/site, and the Lessee is aware that the maximum total weight of vehicles is twelve tons with a maximum width of 2.2 m, maximum height of 2.8 m and maximum length of 6 m. The Lessee agrees to use indicated loading areas and loading routes and to abide by the arrangements made by the Street and Building Office and to pay, by the Street and Building Office required, fees if any.

When moving out, the Lessee is required to at his own expense restore the premises to acceptable condition, regarding wear that is normal for the business, and according to agreements made concerning restoring requirements of alterations made by the Lessee.

Lease Agreement – Appendix 3

The Lessee shall further, at his own expense leave the premises well cleaned, remove and transport away fixtures and equipment (for example telephone and computer wires) specially paid by the Lessee, and shall repair any damage of the building. The Lessee shall on the same occasion give over all front and inner door keys and the like, also if they have been acquired by the Lessee.

What is mentioned in the above paragraph, will apply regardless of whether the Lessee has made the installations before or after the beginning of the Lease.

The Lessee has the right to leave fixtures belonging to him after a written consent from the Lessor. Property left behind without the consent of the Lessor will become the property of the Lessor at the termination of the Lease, or as an alternative the Lessor may, at the same time or later, remove the property at the expense of the Lessee.

At the time of the surrender, the Lessor shall, if he so wishes, call the Lessee to an inspection. Records shall be kept of the inspection.

Rent: SEK 2,074,800 per year comprising rent excluding surcharges indicated in the Agreement and added Appendixes.

The Lessee shall obtain a rebate on the rent with a total of SEK 491,400 (excluding value added tax) during the period of 05-01-2006 – 07-31-2006. Full rent is payable from 08-01-2006.

The Lessee shall, in addition to the rent, compensate the Lessor for heating/hot water and cooling pertaining to the premises of the Lessee. Compensation is payable with SEK 63,385 per year (excluding value added tax). The total amount shall be index adjusted in accordance with the Index Clause, Appendix 1. The compensation shall be paid quarterly, in advance.

To the extent that the Lessee installs his own cooling appliances or other appliances belonging to the business of the Lessee, the Lessee shall, in addition to the rent, pay compensation to the Lessor for water and sewage for the premises of the Lessee. Compensation is payable with an amount equal to the Lessor’s cost price. Separate readings of usage shall be performed. Preliminary costs are billed quarterly in arrears.

The “Lessor’s cost price” refers to costs of water and sewage with surcharges for administration.

Lease Agreement – Appendix 3

If the Lessee, for his business, wishes to connect his own cooling appliances or other appliances to the Building’s cooling system, the Lessee shall, in addition to the rent, pay compensation to the Lessor for usage and fixed cost pertaining to the installation by the Lessee. Compensation is payable with an amount equal to the Lessor’s cost price. Separate readings of usage shall be performed. Preliminary costs are billed quarterly in arrears.

The “Lessor’s cost price” refers to costs of water and sewage with surcharges for administration.

Sorting of waste for recycling is performed in the building. The Lessee is required to follow the stipulations regarding this sorting that the Lessor might from time decide.

The Lessor performs and pays for the equipment etc. in areas intended for sorting of waste for recycling, common to all the Lessees.

The Lessee performs and pays for transfer of the waste to the areas for sorting of waste for recycling.

Other costs for removal, reduced by any proceeds from handling of rest products shall be paid by the Lessee.

Agreement with contractor regarding removal of any hazardous waste, shall be made separately between the Lessor and such contractor.

The Lessee agrees to not obstruct emergency passages on the premises and on the property in any way. The Lessee is aware that he might become liable to damages if this undertaking is not observed.

The Lessee agrees to allow the other Lessees and visitors on the property to use the emergency passages in case of emergency.

The Lessee agrees to, when required, keep the emergency passages available for personnel from the fire department.

Lease Agreement – Appendix 3

The Lessee may not, without written permission from the Lessor, perform alterations of the high-tension electrical installations on the premises.

When larger alterations of electrical installations on the premises are performed, or when the Lessor finds necessary, the Parties shall prepare a special agreement that states the responsibility of the Lessee and the Lessor respectively, according to the Electricity Act and the regulations stipulated by the Electrical Safety Board or other relevant authorities, supported by the Electricity Act or other Law that might replace the Electricity Act. Protection of electrical wires shall be installed according to applicable Swedish Standards. Delimitation of the responsibilities of each Party shall be indicated in plans attached to such Agreement as the one mentioned here. The Parties shall also, while preparing such Agreement, jointly mark with signs on the premises, where the delimitation of responsibility regarding electrical installations lie.

Should such written Agreement as mentioned above not be prepared, or should the Lessee, without required written consent from the Lessor, perform alterations of the electrical installations on the premises, the Lessee shall indemnify the Lessor and any third party.

Where any defects and deficiencies are found in the electrical and sprinkler equipment, which is the property of the Lessee, after an inspection by a relevant authority, the Lessee shall, at his own cost and within the period prescribed by the relevant authority, carry out any measures required. If the Lessee has not rectified the defects and/or deficiencies within the stated time, the Lessor shall be entitled, at the Lessee’s expense, to carry out such measures as are required by the relevant authority. What is described herein also applies to inspections called by insurance company or other instance.

The Lessee shall keep areas to which the maintenance personnel and personnel from the fire department, energy utilities, water and sewerage utilities, the telephone company and similar organizations must have access to, easily accessible. The Lessee may not block the access to such areas with cupboards, crates, goods, and the like.

Whether, pursuant to the provisions of this Agreement or otherwise, the Lessee performs maintenance, improvement, or alteration works on the premises, the Lessee shall provide the Lessor, in direct connection with the completion of such work, with specifications of the building materials – to the extent such are available – for the products and materials to be used on the premises.

Lease Agreement – Appendix 3

Loads of more than 250 kg per square meter may not be placed on the floors (the beams).

The Lessee shall not be entitled to reduction in rent for hindrances or detriments of the user rights due to work performed by the Lessor for regular maintenance of the leased premises or the rest of the property. The Lessor is, however, required to inform the Lessee of the nature and extent of the work as well as of when and during what time period the work will be performed.

All agreements, undertakings and information significant to the parties regarding the conditions of the lease have been included in this Agreement. Beyond what is stated therein, no agreements, undertakings or information has been made or given in connection with the preparation of the Agreement.

Changes or additions to this Agreement and its appendixes shall be made in writing and signed by both parties to be binding.

If what is put forth in the Lease Agreement form contradicts with what is put forth in Special Regulations, then what is put forth in the Special Regulations has precedence.

This Lease Agreement may not be pledged, nor may any part of Lease Agreement be pawned.

Interpretation and application of this Agreement and its appendixes shall subject to Swedish material law.

Disputes regarding the interpretation and application of this Agreement and its appendixes shall be settled in General Court of Law and Rent Tribunal in Sweden.

Lease Agreement – Appendix 3

This Addendum has been drawn up in two identical copies of which the parties have received one each.

Appendix 4 Lease Agreement A0139003-311332

[Floor Plan Image]