Dynamic spectrum access (DSA) has received much attention in recent years as an effort to enhance the spectrum utilization. Primary-secondary usage (PSU) of spectrum is an option of DSA which gathers much study interest. Some modes of secondary usage of spectrum are granted on the condition that the secondary user (SU) releases the spectrum resource immediately whenever the primary user (PU) requests. The SU may hop to an idle spectrum resource, if one is available, or the call is dropped. This spectrum handoff (SH) let the ongoing call continue the session with some degradation of Quality of Service (QoS) for a while. However if the spectrum resource consists of more than one spectrum blocks (SBs) as Public-Private Partnership (PPP) in the upper 700MHz band as Federal Communications Commission (FCC) revised lately, we may reduce the SHs by employing the proposed Cascaded Resource Allocation (CRA) algorithm. In CRA, the SBs are prioritized and the users' accesses are allocated to the SBs considering the priority of the SBs. In this paper we present a generalized model to efficiently make use of multiple SBs and a basic analytical model for prioritized resource access. The performance of CRA is measured by analyzing Markov modulated Poisson process (MMPP) and simulation results.