v3.26.1
Debt - Mortgage Notes Payable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt    
Investments in real estate, net $ 1,294,008 $ 1,204,195
Deferred financing costs (14,123) $ (13,098)
Debt, net 946,245  
ABS Program    
Debt    
Outstanding principal balance from other party $ 493,269  
Weighted average contractual interest rate (in percentage) 5.28%  
Outstanding principal balance $ 134,898  
ABS Program | New Mountain Net Lease Partners II, L.P    
Debt    
Outstanding principal balance 358,371  
ABS Program | Asset pledged as collateral | Single-tenant commercial real estate properties    
Debt    
Investments in real estate, net 700,965  
ABS Program | Asset pledged as collateral | Single-tenant commercial real estate properties | New Mountain Net Lease Partners II, L.P    
Debt    
Investments in real estate, net $ 505,185  
ABS Program, Class A notes    
Debt    
Minimum period considered in determination of prepayment premium 12 months  
Amount of debt instrument $ 338,300  
Weighted average contractual interest rate (in percentage) 5.14%  
Outstanding principal balance $ 92,493  
ABS Program, Class A notes | New Mountain Net Lease Partners II, L.P    
Debt    
Amount of debt instrument $ 245,807  
ABS Program, Class B notes    
Debt    
Minimum period considered in determination of prepayment premium 12 months  
Amount of debt instrument $ 98,700  
Weighted average contractual interest rate (in percentage) 5.33%  
Outstanding principal balance $ 26,985  
ABS Program, Class B notes | New Mountain Net Lease Partners II, L.P    
Debt    
Amount of debt instrument $ 71,715  
ABS Program, Class C notes    
Debt    
Minimum period considered in determination of prepayment premium 12 months  
Amount of debt instrument $ 56,400  
Weighted average contractual interest rate (in percentage) 6.07%  
Outstanding principal balance $ 15,420  
ABS Program, Class C notes | New Mountain Net Lease Partners II, L.P    
Debt    
Amount of debt instrument $ 40,980  
Mortgages at 3.94% Interest    
Debt    
Weighted average contractual interest rate (in percentage) 3.94% 3.94%
Outstanding principal balance $ 782,757 $ 828,621
Mortgage notes    
Debt    
Deferred financing costs (13,303) (13,098)
Debt, net $ 904,352 $ 815,523