-  you can pay X for land to build e.g. 60 apartments or pay up to Y to build up to 100 Units?

You can try to stipulate that in your offer, but it makes the whole deal a very unique and it will not be looked at very favorably by the listing agent, who acts as an advisor to the seller.

I find these to be toys, and not serious business devices. 

And I know it is frustrating, but without knowing your unique circumstances nobody on this site can give you a definitive answer.

For example, say you wanted a list of all the property owners & addresses for all the 3-5 bedroom homes, in x area, with no mortgage, with a lot size of x to y, with an assessed value of x to y, build after x year, with no pool but with a basement, and much more.

Consult with a local attorney, as every jurisdiction is unique, every case is unique, and civil procedure can vary greatly from local court to court.

In our market there are several companies for you to speak with and several things to consider as all turnkey companies are similar in general but we all have our own unique features that make us a little different.

Hello - I recently have gone under contract with a unique multi family property in Bristol, RI.

Property taxes have "Super Lien Status" which is unique to only a couple types of liens.  

They will not accept things such as flushable wipes, personal wipes, baby wipes, paper diapers, sanitary napkins, tampons, wads of toilet paper, dental floss, balls of hair, paper towels, newspapers, grease, oil, table scraps, bones, clothing, rags, sand, dirt, rocks, or children’s toys.