exhibit 10. 4 15 july 2019 kbs us prime property management pte. ltd. 1 raffles place # 40 - 01 one raffles place singapore 048616 kbs reit properties ill llc 800 newport center drive suite 700, newport beach california 92660 dear sirs prime us reit - side letter to kbs subscription agreement 1. we refer to the subscription agreement ( the " subscription agreement " ) dated 27 june 2019 entered into between kbs us prime property management pte. ltd., as manager of prime us reit ( the " manager " ) and kbs reit properties ill llc ( the " investor " ) in relation to the subscription of 228, 408, 999 units in prime us reit ( " subscription units " ) by the investor. 1. 1. we refer to the subscription agreement ( the " subscription agreement " ) dated 27 june 2019 entered into between kbs us prime property management pte. ltd., as manager of prime us reit ( the " manager " ) and kbs reit properties ill llc ( the " investor " ) in relation to the subscription of 228, 408, 999 units in prime us reit ( " subscription units " ) by the investor. we refer to the subscription agreement ( the " subscription agreement " ) dated 27 june 2019 entered into between kbs us prime property management pte. ltd., as manager of prime us reit ( the " manager " ) and kbs reit properties ill llc ( the " investor " ) in relation to the subscription of 228, 408, 999 units in prime us reit ( " subscription units " ) by the investor. 2. we refer to clause 6. 1. 16 of the subscription agreement and acknowledge and agree that the investor has or will be granted a waiver by the trustee of prime us reit ( on the recommendation of the manager ) allowing the investor to own up to a 33. 3 % ( instead of up to 26. 0 % ) interest in prime us reit. 2. 2. we refer to clause 6. 1. 16 of the subscription agreement and acknowledge and agree that the investor has or will be granted a waiver by the trustee of prime us reit ( on the recommendation of the manager ) allowing the investor to own up to a 33. 3 % ( instead of up to 26. 0 % ) interest in prime us reit. we refer to clause 6. 1. 16 of