It probably is bonkers.
DH has a flat and tried to sell it but no takers. We were thinking about renting it out but in all honesty the best solution would probably be to rent our current property out and move into the flat. This would undoubtedly be the most cost effective thing to do.
However, we have one under-one and hope to add to our family at some point soon, probably in around 2018.
So - is it nuts?