"(NOTE: the iframe page is on a server I do not have access to."
Then you can't make any adjustments in the page code. Any page you load into an iframe will automatically load to the top. I don't see how or why you are having this problem? If it is just a matter of reloading the iframe contents, the user right clicks on the iframe and chooses, reload (or refresh) this iframe.
You could try --
<iframe id="blockrandom" name="contentframe" src="
https://www.foobar.com" onClick="window.scrollTo(0
,0);" </iframe>
But the user will still have to click on that area. In the above, you can substitute onMouseOver for onClick, but that will be kind of disastrous -- the person will never be able to scroll down the page !!!