v3.25.2
Cover
Jul. 31, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 31, 2025
Entity File Number 000-56701
Entity Registrant Name New Mountain Net Lease Trust
Entity Central Index Key 0002033695
Entity Tax Identification Number 99-6897976
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 1633 Broadway
Entity Address, Address Line Two 48th Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10019
City Area Code (212)
Local Phone Number 720-0300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false