The conditional of hay (there is/there are) is habría (there would be), eg en mi ciudad ideal habría una piscina (in my ideal town, there would be a swimming pool).

Conditionals are used to express both real, likely and unreal situations. As a result, tenses used with them are not flat; they change. That is why the difference between ‘If I arrive’ and ‘If I had ...

The conditional tense is used to say what might happen under certain conditions. It is called the conditional tense because it is dependent on a certain condition, eg you can only fulfil one thing on ...