You should contact an insurance carrier for specifics on these issues. My information has come from 3 sources, Great Florida Insurance, AAA INsurance and Clifton and Lewis, all local to Sun City Center.
Sounds like everyone has a little different advice for you on this issue; I would tell you to contact a great home inspector and ask them to do a little look for you. Their job is to make sure the homes pass those inspections so they can tell you if something may flag the property when an offer comes in. Please don't do to much without talking to a professional. You would hate to put more money into your home if you are just planning to sell it. I know several great inspectors and would be happy to refer you to them.
If I can answer questions about listings, or real estate in general, please don't hesitate to ask. I am a no pressure, just help kind of Realtor. Review my profile on Trulia and send me a message with your contact info or email me directly at THOYT@prutropical.com if I can send you the inspector info or help in any way.
Prudential Tropical Realty
Michael Foster http://www.lewisplumbingsantabarbara.com/santa-barbara-sewer
Is this work that requires a permit such that a prospective buyer could check county records to see if the unit(s) sharing the same building as the unit on sale have done the replacements?
Also, I've seen listings in Kings Point that state that windows have been replaced. Is this also related to insurance requirements or just an unrelated upgrade some owners are choosing to do?
Licensed Associate Broker
Douglas Elliman Real Estate
For those without money buyer can negotiate that this will be done and paid from closing funds or shared at closing.
With a CASH buyer you can sell any property "as is".
Otherwise normally a house doesn't have to be brought up to current codes unless the buyer's insurer or lender requires it.
A buyer can also pay those costs with a Renovation mortgage, FHA 203K or HomeStyle mortgage.
All the best,