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Noncontrolling Interest
3 Months Ended
Mar. 31, 2024
Noncontrolling Interest [Abstract]  
Noncontrolling Interest Noncontrolling Interest
The following table summarizes the activity for noncontrolling interest in the Company during the three months ended March 31, 2024.

Noncontrolling InterestLTIP UnitsOther Common UnitsTotal Noncontrolling Common UnitsNoncontrolling Interest
Balance at December 31, 20232,361,920 1,467,718 3,829,638 2.1 %
Granted/Issued381,517 — 381,517 N/A
Forfeited— — — N/A
Conversions from LTIP units to Other Common Units(314,982)314,982 — N/A
Redemptions from Other Common Units to common stock— (314,982)(314,982)N/A
Balance at March 31, 20242,428,455 1,467,718 3,896,173 2.1 %

LTIP Units

The Company granted LTIP units under the 2011 Plan on January 8, 2024 to non-employee, independent directors, which will vest on January 1, 2025, subject to the recipient’s continued service. The Company granted LTIP units under the 2011 Plan on January 8, 2024 to certain executive officers and senior employees of the Company, which will vest in equal installments on a quarterly basis over four years, with the first vesting date having been March 31, 2024, subject to the recipient’s continued employment. Refer to Note 8 for a discussion of the LTIP units granted on January 8, 2024 pursuant to the 2021 performance units.
The fair value of the LTIP units as of the grant date was determined by a lattice-binomial option-pricing model based on a Monte Carlo simulation. The fair value of the LTIP units are based on Level 3 inputs and non-recurring fair value measurements. The following table summarizes the assumptions used in valuing such LTIP units granted during the three months ended March 31, 2024 (excluding the LTIP units granted pursuant to the 2021 performance units discussed in Note 8).

LTIP UnitsAssumptions
Grant dateJanuary 8, 2024
Expected term (years)10
Expected stock price volatility25.0 %
Expected dividend yield4.0 %
Risk-free interest rate4.11 %
Fair value of LTIP units at issuance (in thousands)$4,597 
LTIP units at issuance124,235 
Fair value unit price per LTIP unit at issuance$37.00 

The expected stock price volatility is based on a mix of the historical and implied volatilities of the Company and certain peer group companies. The expected dividend yield is based on the Company’s average historical dividend yield and the dividend yield as of the valuation date for each award. The risk-free interest rate is based on U.S. Treasury note yields matching a three-year time period.

The following table summarizes activity related to the Company’s unvested LTIP units during the three months ended March 31, 2024.

Unvested LTIP UnitsLTIP UnitsWeighted Average Grant Date Fair Value per Unit
Balance at December 31, 2023176,926 $34.25 
Granted381,517 $37.00 
Vested(301,269)$36.49 
Forfeited— $— 
Balance at March 31, 2024257,174 $35.71 

The unrecognized compensation expense associated with the Company’s LTIP units at March 31, 2024 was approximately $7.0 million and is expected to be recognized over a weighted average period of approximately 2.7 years.

The following table summarizes the fair value at vesting for the LTIP units that vested during the three months ended March 31, 2024 and 2023.

 Three months ended March 31,
Vested LTIP units20242023
Vested LTIP units301,269 212,230 
Fair value of vested LTIP units (in thousands)$11,620 $7,023