I found out there was a 5 unit apartment building up for sale. How do i found out how much it is being sold 4?
it was put on sale for 6 months but the for sale sign was taken off..even though not being sold i heard something about tax accessors that you can find out on the internet or something im not sure. I just want to be able to contact the owner or the broker.
Answers below in Comments Section

I’d just call a local real estate agent and ask them to check the MLS (Multiple Listing Service). I don’t think the real MLS is available on the internet for free since its a subscription service, but here’s a similar site:
http://www.mls.com/
You can look up the tax bill, maybe online. Go to the webpage for your county government and poke around there. If you can find the tax bill it will have an owner name and address (could be a company and PO box but at least you’ll have a starting place).
If you know the property’s address and the county in which it resides, you can search for that particular county’s tax assessor database. I know a majority of counties that make up metropolitan areas have online tax databases. Usually you are able to search by property address once you find the database (which is provided by the local government so do not trust any website not affiliated with the local government) and it will pull up the tax records for that property. The tax records will include the owner’s name, and sometimes a phone number or mailing address where they can be reached. If the county does not have a local tax database, you will have to go to the county courthouse where property records are kept and research the property there.
The assessed value for tax purposes may not be anywhere close to the true market value or the asking price.
Easiest to start by checking http://www.realtor.com for your city, making sure to select the [] multifamily box in the search criteria.
Second easiest is just to contact a local real estate broker and ask.