Table:
|  | December 31, |  |
| --- | --- | --- |
|  | 2019 | 2018 |
| Owned assets: |  |  |
| Network equipment | $566,936 | $538,761 |
| Leasehold improvements | 227,388 | 214,495 |
| System infrastructure | 134,726 | 124,018 |
| Software | 10,035 | 9,963 |
| Office and other equipment | 18,169 | 16,711 |
| Building | 1,252 | 1,277 |
| Land | 106 | 108 |
|  | 958,612 | 905,333 |
| Less—Accumulated depreciation and amortization | (790,033) | (736,356) |
|  | 168,579 | 168,977 |
| Assets under finance leases: |  |  |
| IRUs | 408,170 | 395,170 |
| Less—Accumulated depreciation and amortization | (207,820) | (188,822) |
|  | 200,350 | 206,348 |
| Property and equipment, net | $368,929 | $375,325 |
Paragraphs:
2. Property and equipment:
Property and equipment consisted of the following (in thousands):
Depreciation and amortization expense related to property and equipment and finance leases was $80.2 million, $81.2 million and $75.9 million, for 2019, 2018 and 2017, respectively.
The Company capitalizes the compensation cost of employees directly involved with its construction activities. In 2019, 2018 and 2017, the Company capitalized compensation costs of $10.7 million, $10.5 million and $9.7 million respectively. These amounts are included in system infrastructure costs.
Exchange agreement
In 2019, 2018 and 2017 the Company exchanged certain used network equipment and cash consideration for new network equipment. The fair value of the new network equipment received was estimated to be $3.3 million, $3.2 million and $9.1 million resulting in gains of $1.0 million, $1.0 million and $3.9 million respectively. The estimated fair value of the equipment received was based upon the cash consideration price the Company pays for the new network equipment on a standalone basis (Level 3).
Installment payment agreement
The Company has entered into an installment payment agreement (“IPA”) with a vendor. Under the IPA the Company may purchase network equipment in exchange for interest free note obligations each with a twenty-four month term. There are no payments under each note obligation for the first six months followed by eighteen equal installment payments for the remaining eighteen month term. As of December 31, 2019 and December 31, 2018, there was $12.5 million and $11.2 million, respectively, of note obligations outstanding under the IPA, secured by the related equipment. The Company recorded the assets purchased and the present value of the note obligation utilizing an imputed interest rate. The resulting discounts totaling $0.4 million and $0.4 million as of December 31, 2019 and December 31, 2018, respectively, under the note obligations are being amortized over the note term using the effective interest rate method.
Question:
What are the respective values of system infrastructure in 2018 and 2019?
Answer: 124,018, 134,726