(7) No park owner may increase the lot rental amount until an approved prospectus has been delivered if one is required. This subsection shall not be construed to prohibit those increases in lot rental amount for those lot rental agreements for which an approved prospectus was required to be delivered and which was delivered on or before July 1, 1986, if the mobile home park owner had:
(a) Filed a prospectus with the division prior to entering into the lot rental agreement;
(b) Made a good faith effort to correct deficiencies cited by the division by responding within the time limit set by the division, if one was set; and
(c) Delivered the approved prospectus to the mobile home owner within 45 days of approval by the division.
This subsection shall not preclude the finding that a lot rental increase is invalid on other grounds and shall not be construed to limit any rights of a mobile home owner or to preclude a mobile home owner from seeking any remedies allowed by this chapter, including a determination that the lot rental agreement or any part thereof is unreasonable.