We characterize intrinsically two classes of manifolds that can be properly embedded into spaces of the form ${\mathbb{P}}^N\setminus {\mathbb{P}}^{N-q}$. The first theorem is a compactification theorem for pseudoconcave manifolds that can be realized as $\overline{X}\setminus (\overline{X}\cap {\mathbb{P}}^{N-q})$ where $\overline{X}\subset {\mathbb{P}}^N$ is a projective variety. The second theorem is an embedding theorem for holomorphically convex manifolds into ${\mathbb{P}}^1\times {ℂ}^N$.