Methods and apparatus for providing quasi-licensed spectrum allocation among two or more entities within a prescribed coverage or operational area. In one embodiment, the quasi-licensed spectrum utilizes 3.5 GHz CBRS (Citizens Broadband Radio Service) spectrum allocated between two or more Federal or commercial SASs (Spectrum Access Systems), for use by various service provider entities such as a managed content delivery network that includes one or more wireless access nodes (e.g., CBSDs). In one variant, each of two or more SAS entities generate both proposed allocations for themselves and other participating SAS entities with respect to available GAA spectrum, and differences between the proposed allocations are reconciled and condensed using a dynamic, iterative process to converge on a final allocation which fits the available GAA spectrum and which equitably distributes the spectrum between the participating SAS entities.