  This paper continues the study of [11, 13] for stationary solutions of
stochastic linear retarded functional differential equations with the emphasis
on delays which appear in those terms including spatial partial derivatives. As
a consequence, the associated stochastic equations have unbounded operators
acting on the discrete or distributed delayed terms, while the operator acting
on the instantaneous term generates a strongly continuous semigroup. We present
conditions on the delay systems to obtain a unique stationary solution by
combining spectrum analysis of unbounded operators and stochastic calculus. A
few instructive cases are analyzed in detail to clarify the underlying
complexity in the study of systems with unbounded delayed operators.
