What should be the value of raw land (in percentage) from a given price of a built house ($750K)?

The best is to buy raw land and get it shovel ready meaning site prepped with plans and permits approved and then sell that 

I have toyed around with the idea of buying raw/vacant land, and running the site planning thru my firm, then selling that shovel ready land for a profit.

Andrew, you bring up some very real and raw issues regarding REI that many don't talk about. 

Hey I work closely with Raw property management they do manage section 8 and would be happy to help  https://g.co/kgs/6YsQjp

If you wanted to refinance the raw land maybe you can get 50% of current as is value not what it will be when completed.So that's three loans at lets guess $15000 X 3 = $45000 plus interest reserve and carry cost.

WHOLESALE- This is the value of the raw land, a discounted amount for the utilities and the wholesale value of that one trailer. 

But region-8 I thought was pretty raw still.

Old post but I am also in the Portland area looking into starting a tiny house community on a piece of raw land zoned manufactured home park.

I've looked for scrapes that come with a w/s tap already and think there's some potential there, but you're already back up to an average of $75k - almost the same as raw land with the new taps.I think your best bet might be to find a community willing to rezone a large parcel to try out the density you're describing.