4. Identified Intangible Assets, Net

Identified intangible assets, net consisted of the following as of March 31, 2020 and December 31, 2019:



	March 31, 2020		December 31, 2019
Amortized intangible assets:
In-place leases, net of accumulated amortization of $21,851,000 and $18,273,000 as of March 31, 2020 and December 31, 2019, respectively (with a weighted average remaining life of 8.5 years and 9.5 years as of March 31, 2020 and December 31, 2019, respectively)	$	74,975,000	$	70,650,000
Above-market leases, net of accumulated amortization of $719,000 and $609,000 as of March 31, 2020 and December 31, 2019, respectively (with a weighted average remaining life of 9.4 years and 9.5 years as of March 31, 2020 and December 31, 2019, respectively)	2,915,000		3,025,000
Unamortized intangible assets:
Certificates of need	348,000		348,000
Total	$	78,238,000	$	74,023,000

Amortization expense on identified intangible assets for the three months ended March 31, 2020 and 2019 was $4,756,000 and $9,142,000, respectively, which included $110,000 and $47,000, respectively, of amortization recorded against real estate revenue for above-market leases in our accompanying condensed consolidated statements of operations.

The aggregate weighted average remaining life of the identified intangible assets was 8.5 years and 9.5 years as of March 31, 2020 and December 31, 2019, respectively. As of March 31, 2020, estimated amortization expense on the identified intangible assets for the nine months ending December 31, 2020 and for each of the next four years ending December 31 and thereafter was as follows:



Year	Amount
2020	$	13,992,000
2021	12,006,000
2022	8,674,000
2023	7,410,000
2024	6,162,000
Thereafter	29,646,000
Total	$	77,890,000