Indiana Code Title 32. Property § 32-25.5-3-9

(1) The declarant's consent to an amendment may be required if:

(2) The consent of the owners to the amendment has been obtained as evidenced by either of the following:

The governing documents may not require that the consent of more than seventy-five percent (75%) of the owners is required for consent under this subdivision.

(3) If the consent of first mortgage holders is required, only first mortgage holders that provide an address to the secretary of the board must be notified.  The consent of a first mortgage holder must be indicated in a written instrument signed by the mortgage holder.  However, a mortgage holder is considered to have consented to a proposed amendment if the mortgage holder does not respond to a written request for consent within thirty (30) days after the mortgage holder receives the request.  The governing documents may not require that the consent of more than seventy-five percent (75%) of first mortgage holders eligible to receive notice is required for consent under this subdivision.

(4) Notwithstanding subdivisions (1) through (3), the governing documents may require the approval of at least ninety-five percent (95%) of the owners to convey common areas or to dissolve the plan of governance for the homeowners association.