[planarchy]

I assume Sloan's and the others were a similar scheme to the proposed townhomes. There is an income threshold and a second mortgage is registered against the property for a percentage of the total value. This has to paid back upon the first sale. It discourages flipping. After the original buyer sells it is a standard market unit. The money paid back on the second mortgage goes back into a pot that is redistributed to other housing projects. The Daniel's Corporation in Toronto, people behind regent park reno, run similar programs I believe. This reduces the upfront cost for buyers but makes it up on back end.