Commitments and Contingencies Commitments Under Existing Agreements Certain lease agreements include provisions that, at the option of the tenant, may obligate Piedmont to provide funding for capital improvements. Under its existing lease agreements, Piedmont may be required to fund significant tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. Further, Piedmont classifies such tenant and building improvements into two classes: (i) improvements which incrementally enhance the building's asset value by expanding its revenue generating capacity ( incremental capital expenditures ) and (ii) improvements which maintain the building's existing asset value and its revenue generating capacity ( non-incremental capital expenditures ). As of September 30, 2013 , Piedmont anticipates funding potential non-incremental capital expenditures for tenant improvements of approximately $93.7 million related to its existing lease portfolio over the respective lease terms, the majority of which Piedmont estimates may be required to be funded over the next several years. For most of Piedmont s leases, the timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement. In some cases, these obligations may expire with the leases without further recourse to Piedmont. Additionally, as of September 30, 2013 , commitments for incremental capital expenditures for tenant improvements associated with new leases, primarily at value-add properties, totaled approximately $23.6 million . Contingencies Related to Tenant Audits/Disputes Certain lease agreements include provisions that grant tenants the right to engage independent auditors to audit their annual operating expense reconciliations. Such audits may result in the re-interpretation of language in the lease agreements which could