., but I have had them shut down new business in a certain area if they've reached their "threshold" in that zip code or geographical area.We have a "retirement" community close to me where one carrier ended up with a majority of the risk there and they were real nervous about it for a long while. 

This is outlined in Title 18, Section 1725 of the United States Code, which states that any person who knowingly and willfully deposits any mailable matter such as statements of accounts, circulars, sale bills, or other like matter, on which no postage has been paid, into any letter box established, approved, or accepted by the Postal Service for the receipt or delivery of mail matter on any mail route with intent to avoid payment of lawful postage thereon, shall for each such offense be fined under this title.Violating this law can result in a fine for each piece of mail that is improperly deposited.

automating lock codes? 

I'm wondering how people go about leasing their section 8 properties when max rent allowance for a zip code is significantly higher than market-rate (non-subsidized).

If you need MLS data, partner with a Realtor who can send you a list of all the items in a Zip Code.

I have discount codes for those last two if you need em, investors usually go with the first few ones though.

The ceiling height must be up to code, windows must be standard size, etc.

What Tax code can I look up to read this?

I am a new to the Cape Coral market and have a new build which will be finish in about 6 month or so in the zip code 33909.

Each municipality will have their own laws and codes on the books for it.