what type of properties qualify for a secondary market conventional loan?

Generally 1-4 unit homes, most condo's and townhouses that are in reasonable good condition. What is or can be difficult to finance: condos (depending on the regime), mobile/manufactured homes, commercial, more than 4 apartments, farms, mixed use properties, seasonal homes, vacant lots or land, etc. Even homes that need extensive repairs can be financed with a conventional loan using a renovation loan where needed/desired repairs will be completed within a few months or so after closing.

Phil covered it