NRS 350.694
Conditions for refunding bonds.
1.
No bonds may be refunded under this chapter unless the holders thereof voluntarily surrender them for exchange or payment, or unless they either mature or are callable for prior redemption under their terms within 25 years from the date of issuance of the refunding bonds. Provision must be made for paying the securities within that period.2.
The maturity of any bond refunded may not be extended beyond 25 years, or beyond 1 year next following the date of the last outstanding maturity, whichever limitation is later, nor may any interest on any bond refunded be increased to any rate which exceeds the limit provided in NRS 350.2011.3.
The principal amount of the refunding bonds may exceed the principal amount of the refunded bonds, but in the case of any bonds constituting a debt the principal of the bonds may not be increased to any amount in excess of any municipal debt limitation.4.
The principal amount of the refunding bonds may also be less than or the same as the principal amount of the bonds being refunded so long as provision is duly and sufficiently made for their payment.5.
If at the time of the issuance of any issue of general obligation refunding bonds provision is not made for the redemption of all the outstanding bonds of the issue refunded or the outstanding bonds of each issue refunded, as the case may be, by the use of proceeds of the refunding bonds and any other money available for the redemption, the general obligation refunding bonds may mature but are not required to mature serially in accordance with subsections 2 and 3 of NRS 350.630.
Source:
Section 350.694 — Conditions for refunding bonds., https://www.leg.state.nv.us/NRS/NRS-350.html#NRS350Sec694.